<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:a80a1d85-d222-4f41-ba9f-844636cf1f8b,g:17422749-133e-4fe3-9091-dc8e0f45c575-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:wst="http://www.westpharma.com/20201231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.westpharma.com/20201231">
  <xs:import namespace="http://fasb.org/srt/2020-01-31" schemaLocation="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2020-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd"/>
  <xs:import namespace="http://www.w3.org/1999/xlink" schemaLocation="http://www.xbrl.org/2003/xlink-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2020-01-31" schemaLocation="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/currency/2020-01-31" schemaLocation="https://xbrl.sec.gov/currency/2020/currency-2020-01-31.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2020-01-31" schemaLocation="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wst-20201231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wst-20201231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wst-20201231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="wst-20201231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://www.westpharma.com/role/Cover">
        <link:definition>000010001 - Document - Cover</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFINCOME" roleURI="http://www.westpharma.com/role/CONSOLIDATEDSTATEMENTSOFINCOME">
        <link:definition>100010002 - Statement - CONSOLIDATED STATEMENTS OF INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME" roleURI="http://www.westpharma.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOME">
        <link:definition>100020003 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical" roleURI="http://www.westpharma.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMEParenthetical">
        <link:definition>100030004 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.westpharma.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>100040005 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.westpharma.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>100050006 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTOFEQUITY" roleURI="http://www.westpharma.com/role/CONSOLIDATEDSTATEMENTOFEQUITY">
        <link:definition>100060007 - Statement - CONSOLIDATED STATEMENT OF EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.westpharma.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>100070008 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPolicies" roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPolicies">
        <link:definition>210011001 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies" roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesPolicies">
        <link:definition>220022001 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPoliciesTables" roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesTables">
        <link:definition>230033001 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails" roleURI="http://www.westpharma.com/role/BasisofPresentationandSummaryofSignificantAccountingPoliciesDetails">
        <link:definition>240044001 - Disclosure - Basis of Presentation and Summary of Significant Accounting Policies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingStandards" roleURI="http://www.westpharma.com/role/NewAccountingStandards">
        <link:definition>210051002 - Disclosure - New Accounting Standards</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NewAccountingStandardsDetails" roleURI="http://www.westpharma.com/role/NewAccountingStandardsDetails">
        <link:definition>240064002 - Disclosure - New Accounting Standards (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Revenue" roleURI="http://www.westpharma.com/role/Revenue">
        <link:definition>210071003 - Disclosure - Revenue</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueTables" roleURI="http://www.westpharma.com/role/RevenueTables">
        <link:definition>230083002 - Disclosure - Revenue (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueAdoptionofASC606Details" roleURI="http://www.westpharma.com/role/RevenueAdoptionofASC606Details">
        <link:definition>240094003 - Disclosure - Revenue - Adoption of ASC 606 (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueRevenueRecognitionDetails" roleURI="http://www.westpharma.com/role/RevenueRevenueRecognitionDetails">
        <link:definition>240104004 - Disclosure - Revenue - Revenue Recognition (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueContractsAssetsandLiabilitiesDetails" roleURI="http://www.westpharma.com/role/RevenueContractsAssetsandLiabilitiesDetails">
        <link:definition>240114005 - Disclosure - Revenue - Contracts Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueContractsandLiabilitiesNarrativeDetails" roleURI="http://www.westpharma.com/role/RevenueContractsandLiabilitiesNarrativeDetails">
        <link:definition>240124006 - Disclosure - Revenue - Contracts and Liabilities, Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueSupplyChainFinancingDetails" roleURI="http://www.westpharma.com/role/RevenueSupplyChainFinancingDetails">
        <link:definition>240134007 - Disclosure - Revenue - Supply Chain Financing (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RevenueVoluntaryRecallDetails" roleURI="http://www.westpharma.com/role/RevenueVoluntaryRecallDetails">
        <link:definition>240144008 - Disclosure - Revenue - Voluntary Recall (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomePerShare" roleURI="http://www.westpharma.com/role/NetIncomePerShare">
        <link:definition>210151004 - Disclosure - Net Income Per Share</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomePerShareTables" roleURI="http://www.westpharma.com/role/NetIncomePerShareTables">
        <link:definition>230163003 - Disclosure - Net Income Per Share (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="NetIncomePerShareDetails" roleURI="http://www.westpharma.com/role/NetIncomePerShareDetails">
        <link:definition>240174009 - Disclosure - Net Income Per Share (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipment" roleURI="http://www.westpharma.com/role/PropertyPlantandEquipment">
        <link:definition>210181005 - Disclosure - Property, Plant and Equipment</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipmentTables" roleURI="http://www.westpharma.com/role/PropertyPlantandEquipmentTables">
        <link:definition>230193004 - Disclosure - Property, Plant and Equipment (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipmentPropertyPlantandEquipmentGrossDetails" roleURI="http://www.westpharma.com/role/PropertyPlantandEquipmentPropertyPlantandEquipmentGrossDetails">
        <link:definition>240204010 - Disclosure - Property, Plant and Equipment - Property, Plant and Equipment, Gross (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PropertyPlantandEquipmentNarrativeDetails" roleURI="http://www.westpharma.com/role/PropertyPlantandEquipmentNarrativeDetails">
        <link:definition>240214011 - Disclosure - Property, Plant and Equipment - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Leases" roleURI="http://www.westpharma.com/role/Leases">
        <link:definition>210221006 - Disclosure - Leases</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesTables" roleURI="http://www.westpharma.com/role/LeasesTables">
        <link:definition>230233005 - Disclosure - Leases (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesAdoptionofASC842Details" roleURI="http://www.westpharma.com/role/LeasesAdoptionofASC842Details">
        <link:definition>240244012 - Disclosure - Leases - Adoption of ASC 842 (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseCostDetails" roleURI="http://www.westpharma.com/role/LeasesLeaseCostDetails">
        <link:definition>240254013 - Disclosure - Leases - Lease Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseCashFlowandSupplementalInformationDetails" roleURI="http://www.westpharma.com/role/LeasesLeaseCashFlowandSupplementalInformationDetails">
        <link:definition>240264014 - Disclosure - Leases - Lease Cash Flow and Supplemental Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesLeaseWeightedAverageDetails" roleURI="http://www.westpharma.com/role/LeasesLeaseWeightedAverageDetails">
        <link:definition>240274015 - Disclosure - Leases - Lease Weighted Average (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesofOperatingLeaseLiabilitiesDetails" roleURI="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails">
        <link:definition>240284016 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1" roleURI="http://www.westpharma.com/role/LeasesMaturitiesofOperatingLeaseLiabilitiesDetails_1">
        <link:definition>240284016 - Disclosure - Leases - Maturities of Operating Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AffiliatedCompanies" roleURI="http://www.westpharma.com/role/AffiliatedCompanies">
        <link:definition>210291007 - Disclosure - Affiliated Companies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AffiliatedCompaniesTables" roleURI="http://www.westpharma.com/role/AffiliatedCompaniesTables">
        <link:definition>230303006 - Disclosure - Affiliated Companies (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AffiliatedCompaniesScheduleofInvestmentsDetails" roleURI="http://www.westpharma.com/role/AffiliatedCompaniesScheduleofInvestmentsDetails">
        <link:definition>240314017 - Disclosure - Affiliated Companies - Schedule of Investments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AffiliatedCompaniesNarrativeDetails" roleURI="http://www.westpharma.com/role/AffiliatedCompaniesNarrativeDetails">
        <link:definition>240324018 - Disclosure - Affiliated Companies - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandIntangibleAssets" roleURI="http://www.westpharma.com/role/GoodwillandIntangibleAssets">
        <link:definition>210331008 - Disclosure - Goodwill and Intangible Assets</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandIntangibleAssetsTables" roleURI="http://www.westpharma.com/role/GoodwillandIntangibleAssetsTables">
        <link:definition>230343007 - Disclosure - Goodwill and Intangible Assets (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandIntangibleAssetsGoodwillDetails" roleURI="http://www.westpharma.com/role/GoodwillandIntangibleAssetsGoodwillDetails">
        <link:definition>240354019 - Disclosure - Goodwill and Intangible Assets - Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandIntangibleAssetsNarrativeDetails" roleURI="http://www.westpharma.com/role/GoodwillandIntangibleAssetsNarrativeDetails">
        <link:definition>240364020 - Disclosure - Goodwill and Intangible Assets - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GoodwillandIntangibleAssetsIntangibleAssetsbyMajorClassDetails" roleURI="http://www.westpharma.com/role/GoodwillandIntangibleAssetsIntangibleAssetsbyMajorClassDetails">
        <link:definition>240374021 - Disclosure - Goodwill and Intangible Assets - Intangible Assets by Major Class (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherCurrentLiabilities" roleURI="http://www.westpharma.com/role/OtherCurrentLiabilities">
        <link:definition>210381009 - Disclosure - Other Current Liabilities</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherCurrentLiabilitiesTables" roleURI="http://www.westpharma.com/role/OtherCurrentLiabilitiesTables">
        <link:definition>230393008 - Disclosure - Other Current Liabilities (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherCurrentLiabilitiesDetails" roleURI="http://www.westpharma.com/role/OtherCurrentLiabilitiesDetails">
        <link:definition>240404022 - Disclosure - Other Current Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="Debt" roleURI="http://www.westpharma.com/role/Debt">
        <link:definition>210411010 - Disclosure - Debt</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtTables" roleURI="http://www.westpharma.com/role/DebtTables">
        <link:definition>230423009 - Disclosure - Debt (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtScheduleofDebtDetails" roleURI="http://www.westpharma.com/role/DebtScheduleofDebtDetails">
        <link:definition>240434023 - Disclosure - Debt - Schedule of Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtScheduleofDebtDetails_1" roleURI="http://www.westpharma.com/role/DebtScheduleofDebtDetails_1">
        <link:definition>240434023 - Disclosure - Debt - Schedule of Debt (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DebtNarrativeDetails" roleURI="http://www.westpharma.com/role/DebtNarrativeDetails">
        <link:definition>240444024 - Disclosure - Debt - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstruments" roleURI="http://www.westpharma.com/role/DerivativeFinancialInstruments">
        <link:definition>210451011 - Disclosure - Derivative Financial Instruments</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsTables" roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsTables">
        <link:definition>230463010 - Disclosure - Derivative Financial Instruments (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsNarrativeDetails" roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsNarrativeDetails">
        <link:definition>240474025 - Disclosure - Derivative Financial Instruments - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsForeignExchangeRateRiskDetails" roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsForeignExchangeRateRiskDetails">
        <link:definition>240484026 - Disclosure - Derivative Financial Instruments - Foreign Exchange Rate Risk (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DerivativeFinancialInstrumentsEffectsofDerivativeInstrumentsonOCIandEarningsDetails" roleURI="http://www.westpharma.com/role/DerivativeFinancialInstrumentsEffectsofDerivativeInstrumentsonOCIandEarningsDetails">
        <link:definition>240494027 - Disclosure - Derivative Financial Instruments - Effects of Derivative Instruments on OCI and Earnings (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurements" roleURI="http://www.westpharma.com/role/FairValueMeasurements">
        <link:definition>210501012 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsTables" roleURI="http://www.westpharma.com/role/FairValueMeasurementsTables">
        <link:definition>230513011 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsFairValueofAssetsandLiabilitiesDetails" roleURI="http://www.westpharma.com/role/FairValueMeasurementsFairValueofAssetsandLiabilitiesDetails">
        <link:definition>240524028 - Disclosure - Fair Value Measurements - Fair Value of Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsChangesinLevel3FairValueMeasurementsDetails" roleURI="http://www.westpharma.com/role/FairValueMeasurementsChangesinLevel3FairValueMeasurementsDetails">
        <link:definition>240534029 - Disclosure - Fair Value Measurements - Changes in Level 3 Fair Value Measurements (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="FairValueMeasurementsOtherFinancialInstrumentsDetails" roleURI="http://www.westpharma.com/role/FairValueMeasurementsOtherFinancialInstrumentsDetails">
        <link:definition>240544030 - Disclosure - Fair Value Measurements - Other Financial Instruments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLoss" roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLoss">
        <link:definition>210551013 - Disclosure - Accumulated Other Comprehensive Loss</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossTables" roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossTables">
        <link:definition>230563012 - Disclosure - Accumulated Other Comprehensive Loss (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeDetails" roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossComponentsofAccumulatedOtherComprehensiveIncomeDetails">
        <link:definition>240574031 - Disclosure - Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AccumulatedOtherComprehensiveLossOtherComprehensiveLossReclassificationsDetails" roleURI="http://www.westpharma.com/role/AccumulatedOtherComprehensiveLossOtherComprehensiveLossReclassificationsDetails">
        <link:definition>240584032 - Disclosure - Accumulated Other Comprehensive Loss - Other Comprehensive Loss Reclassifications (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensation" roleURI="http://www.westpharma.com/role/StockBasedCompensation">
        <link:definition>210591014 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationTables" roleURI="http://www.westpharma.com/role/StockBasedCompensationTables">
        <link:definition>230603013 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationNarrativeDetails" roleURI="http://www.westpharma.com/role/StockBasedCompensationNarrativeDetails">
        <link:definition>240614033 - Disclosure - Stock-Based Compensation - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationAllocationofSharebasedCompensationCostsDetails" roleURI="http://www.westpharma.com/role/StockBasedCompensationAllocationofSharebasedCompensationCostsDetails">
        <link:definition>240624034 - Disclosure - Stock-Based Compensation - Allocation of Share-based Compensation Costs (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationStockOptionsActivityDetails" roleURI="http://www.westpharma.com/role/StockBasedCompensationStockOptionsActivityDetails">
        <link:definition>240634035 - Disclosure - Stock-Based Compensation - Stock Options Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationStockAppreciationRightsAwardActivityDetails" roleURI="http://www.westpharma.com/role/StockBasedCompensationStockAppreciationRightsAwardActivityDetails">
        <link:definition>240644036 - Disclosure - Stock-Based Compensation - Stock Appreciation Rights Award Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="StockBasedCompensationNonvestedPerformancebasedAwardActivityDetails" roleURI="http://www.westpharma.com/role/StockBasedCompensationNonvestedPerformancebasedAwardActivityDetails">
        <link:definition>240654037 - Disclosure - Stock-Based Compensation - Nonvested Performance-based Award Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlans" roleURI="http://www.westpharma.com/role/BenefitPlans">
        <link:definition>210661015 - Disclosure - Benefit Plans</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansTables" roleURI="http://www.westpharma.com/role/BenefitPlansTables">
        <link:definition>230673014 - Disclosure - Benefit Plans (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansNarrativeDetails" roleURI="http://www.westpharma.com/role/BenefitPlansNarrativeDetails">
        <link:definition>240684038 - Disclosure - Benefit Plans - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansComponentsofNetPeriodicBenefitCostDetails" roleURI="http://www.westpharma.com/role/BenefitPlansComponentsofNetPeriodicBenefitCostDetails">
        <link:definition>240694039 - Disclosure - Benefit Plans - Components of Net Periodic Benefit Cost (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansChangesinProjectedBenefitObligationFairValueofPlanAssetsandFundedStatusDetails" roleURI="http://www.westpharma.com/role/BenefitPlansChangesinProjectedBenefitObligationFairValueofPlanAssetsandFundedStatusDetails">
        <link:definition>240704040 - Disclosure - Benefit Plans - Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansAmountsRecognizedinBalanceSheetDetails" roleURI="http://www.westpharma.com/role/BenefitPlansAmountsRecognizedinBalanceSheetDetails">
        <link:definition>240714041 - Disclosure - Benefit Plans - Amounts Recognized in Balance Sheet (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansAmountsRecognizedinOtherComprehensiveIncomeLossDetails" roleURI="http://www.westpharma.com/role/BenefitPlansAmountsRecognizedinOtherComprehensiveIncomeLossDetails">
        <link:definition>240724042 - Disclosure - Benefit Plans - Amounts Recognized in Other Comprehensive Income (Loss) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansExpectedBenefitPaymentsDetails" roleURI="http://www.westpharma.com/role/BenefitPlansExpectedBenefitPaymentsDetails">
        <link:definition>240734043 - Disclosure - Benefit Plans - Expected Benefit Payments (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansAssumptionsUsedDetails" roleURI="http://www.westpharma.com/role/BenefitPlansAssumptionsUsedDetails">
        <link:definition>240744044 - Disclosure - Benefit Plans - Assumptions Used (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansWeightedAverageInterestCreditingRatingbyGeographicLocationDetails" roleURI="http://www.westpharma.com/role/BenefitPlansWeightedAverageInterestCreditingRatingbyGeographicLocationDetails">
        <link:definition>240754045 - Disclosure - Benefit Plans - Weighted Average Interest Crediting Rating by Geographic Location (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="BenefitPlansAllocationofPlanAssetsDetails" roleURI="http://www.westpharma.com/role/BenefitPlansAllocationofPlanAssetsDetails">
        <link:definition>240764046 - Disclosure - Benefit Plans - Allocation of Plan Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherExpenseIncome" roleURI="http://www.westpharma.com/role/OtherExpenseIncome">
        <link:definition>210771016 - Disclosure - Other Expense (Income)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherExpenseIncomeTables" roleURI="http://www.westpharma.com/role/OtherExpenseIncomeTables">
        <link:definition>230783015 - Disclosure - Other Expense (Income) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherExpenseIncomeScheduleofOtherIncomeExpenseDetails" roleURI="http://www.westpharma.com/role/OtherExpenseIncomeScheduleofOtherIncomeExpenseDetails">
        <link:definition>240794047 - Disclosure - Other Expense (Income) - Schedule of Other (Income) Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherExpenseIncomeNarrativeDetails" roleURI="http://www.westpharma.com/role/OtherExpenseIncomeNarrativeDetails">
        <link:definition>240804048 - Disclosure - Other Expense (Income) - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="OtherExpenseIncomeScheduleofRestructuringandRelatedChargesDetails" roleURI="http://www.westpharma.com/role/OtherExpenseIncomeScheduleofRestructuringandRelatedChargesDetails">
        <link:definition>240814049 - Disclosure - Other Expense (Income) - Schedule of Restructuring and Related Charges (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxes" roleURI="http://www.westpharma.com/role/IncomeTaxes">
        <link:definition>210821017 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesTables" roleURI="http://www.westpharma.com/role/IncomeTaxesTables">
        <link:definition>230833016 - Disclosure - Income Taxes (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesUnrecognizedTaxBenefitsDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesUnrecognizedTaxBenefitsDetails">
        <link:definition>240844050 - Disclosure - Income Taxes - Unrecognized Tax Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesNarrativeDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesNarrativeDetails">
        <link:definition>240854051 - Disclosure - Income Taxes - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesIncomeBeforeIncomeTaxesDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesIncomeBeforeIncomeTaxesDetails">
        <link:definition>240864052 - Disclosure - Income Taxes - Income Before Income Taxes (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesComponentsofIncomeTaxExpenseDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesComponentsofIncomeTaxExpenseDetails">
        <link:definition>240874053 - Disclosure - Income Taxes - Components of Income Tax Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>240884054 - Disclosure - Income Taxes - Deferred Tax Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="IncomeTaxesEffectiveIncomeTaxReconciliationDetails" roleURI="http://www.westpharma.com/role/IncomeTaxesEffectiveIncomeTaxReconciliationDetails">
        <link:definition>240894055 - Disclosure - Income Taxes - Effective Income Tax Reconciliation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingencies" roleURI="http://www.westpharma.com/role/CommitmentsandContingencies">
        <link:definition>210901018 - Disclosure - Commitments and Contingencies</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CommitmentsandContingenciesDetails" roleURI="http://www.westpharma.com/role/CommitmentsandContingenciesDetails">
        <link:definition>240914056 - Disclosure - Commitments and Contingencies (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformation" roleURI="http://www.westpharma.com/role/SegmentInformation">
        <link:definition>210921019 - Disclosure - Segment Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationTables" roleURI="http://www.westpharma.com/role/SegmentInformationTables">
        <link:definition>230933017 - Disclosure - Segment Information (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationNarrativeDetails" roleURI="http://www.westpharma.com/role/SegmentInformationNarrativeDetails">
        <link:definition>240944057 - Disclosure - Segment Information - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationSalesbyProductGroupDetails" roleURI="http://www.westpharma.com/role/SegmentInformationSalesbyProductGroupDetails">
        <link:definition>240954058 - Disclosure - Segment Information - Sales by Product Group (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationSalesandLonglivedAssetsbyGeographicLocationDetails" roleURI="http://www.westpharma.com/role/SegmentInformationSalesandLonglivedAssetsbyGeographicLocationDetails">
        <link:definition>240964059 - Disclosure - Segment Information - Sales and Long-lived Assets by Geographic Location (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SegmentInformationSegmentFinancialInformationDetails" roleURI="http://www.westpharma.com/role/SegmentInformationSegmentFinancialInformationDetails">
        <link:definition>240974060 - Disclosure - Segment Information - Segment Financial Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyOperatingandPerShareDataUnaudited" roleURI="http://www.westpharma.com/role/QuarterlyOperatingandPerShareDataUnaudited">
        <link:definition>210981020 - Disclosure - Quarterly Operating and Per Share Data (Unaudited)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyOperatingandPerShareDataUnauditedTables" roleURI="http://www.westpharma.com/role/QuarterlyOperatingandPerShareDataUnauditedTables">
        <link:definition>230993018 - Disclosure - Quarterly Operating and Per Share Data (Unaudited) (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="QuarterlyOperatingandPerShareDataUnauditedDetails" roleURI="http://www.westpharma.com/role/QuarterlyOperatingandPerShareDataUnauditedDetails">
        <link:definition>241004061 - Disclosure - Quarterly Operating and Per Share Data (Unaudited) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIIValuationandQualifyingAccounts" roleURI="http://www.westpharma.com/role/ScheduleIIValuationandQualifyingAccounts">
        <link:definition>211011021 - Disclosure - Schedule II - Valuation and Qualifying Accounts</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="ScheduleIIValuationandQualifyingAccountsDetails" roleURI="http://www.westpharma.com/role/ScheduleIIValuationandQualifyingAccountsDetails">
        <link:definition>241024062 - Disclosure - Schedule II - Valuation and Qualifying Accounts (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="wst_PharmaTapSADeCVMember" abstract="true" name="PharmaTapSADeCVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumberOfSharesIssuableUponVesting" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedToVestNumberOfSharesIssuableUponVesting" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_ExpirationPeriodDomain" abstract="true" name="ExpirationPeriodDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_YearAfter2021Member" abstract="true" name="YearAfter2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_PharmaCustomersMember" abstract="true" name="PharmaCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ContractManufacturedCustomersMember" abstract="true" name="ContractManufacturedCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_CreditFacilityIsAvailableForSwingLineLoans" abstract="false" name="CreditFacilityIsAvailableForSwingLineLoans" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_BusinessCombinationContingentConsiderationMeasurementInput" abstract="false" name="BusinessCombinationContingentConsiderationMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_LegalMattersContingenciesAndLegalCostsPolicyTextBlock" abstract="false" name="LegalMattersContingenciesAndLegalCostsPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wst_PensionSettlementAndRelatedCharges" abstract="false" name="PensionSettlementAndRelatedCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ScheduleOfIntangibleAssetsByMajorClassTableTextBlock" abstract="false" name="ScheduleOfIntangibleAssetsByMajorClassTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wst_ContractWithCustomerLiabilityRollForward" abstract="true" name="ContractWithCustomerLiabilityRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_OtherMutualFundsMember" abstract="true" name="OtherMutualFundsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_NotesPayableAndOtherDebtCurrent" abstract="false" name="NotesPayableAndOtherDebtCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_StockSettledStockAppreciationRightsOutstanding" abstract="false" name="StockSettledStockAppreciationRightsOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_GenericsCustomersMember" abstract="true" name="GenericsCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardActualPayoutPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardActualPayoutPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_AssetsDefinedBenefitPlansNoncurrent" abstract="false" name="AssetsDefinedBenefitPlansNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_The2020RestructuringPlanMember" abstract="true" name="The2020RestructuringPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ContractWithCustomerLiabilityIncreaseDecreaseDueToAdditionalCashPayments" abstract="false" name="ContractWithCustomerLiabilityIncreaseDecreaseDueToAdditionalCashPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_CostInvestmentImpairment" abstract="false" name="CostInvestmentImpairment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_CashSettledPSUAwardsMember" abstract="true" name="CashSettledPSUAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_DeferredCompensationArrangementWithIndividualNumberOfPlans" abstract="false" name="DeferredCompensationArrangementWithIndividualNumberOfPlans" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wst_IncomeTaxBenefitFromChangeInEnactedTaxRateImpactOnDilutedEarningsPerShare" abstract="false" name="IncomeTaxBenefitFromChangeInEnactedTaxRateImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_FixedAssetImpairmentFromRestructuringImpactOnDilutedEarningsPerShare" abstract="false" name="FixedAssetImpairmentFromRestructuringImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_DaikyoSeikoLtdDaikyoMember" abstract="true" name="DaikyoSeikoLtdDaikyoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsAboveBelowTargetWeightedAverageGrantDateFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsAboveBelowTargetWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare" abstract="false" name="IncomeTaxBenefitFromStockBasedCompensationImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_CreditAvailableForIssuanceOfLettersOfCredit" abstract="false" name="CreditAvailableForIssuanceOfLettersOfCredit" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_OtherComprehensiveIncomeLossDefinedBenefitPlanSettlementGainLossBeforeTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanSettlementGainLossBeforeTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_LineOfCreditFacilityAdditionalBorrowingCapacity" abstract="false" name="LineOfCreditFacilityAdditionalBorrowingCapacity" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_DevelopmentAndLicensingIncome" abstract="false" name="DevelopmentAndLicensingIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePriceRollForward" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePriceRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_WestCompanyMexicoSADeCVMember" abstract="true" name="WestCompanyMexicoSADeCVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_LesseeOperatingLeaseOptionToTerminateTerm" abstract="false" name="LesseeOperatingLeaseOptionToTerminateTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wst_ProbabilitiesOfSuccessfulFDAApprovalMember" abstract="true" name="ProbabilitiesOfSuccessfulFDAApprovalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_IncentiveStockAwardsMember" abstract="true" name="IncentiveStockAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyExchangeRateChanges" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlanForeignCurrencyExchangeRateChanges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_StandardPackagingMember" abstract="true" name="StandardPackagingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_BiologicsCustomersMember" abstract="true" name="BiologicsCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ContractWithCustomerAssetRollForward" abstract="true" name="ContractWithCustomerAssetRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_ContractManufacturedProductsMember" abstract="true" name="ContractManufacturedProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_DeferredFederalStateAndLocalIncomeTaxExpenseBenefit" abstract="false" name="DeferredFederalStateAndLocalIncomeTaxExpenseBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_FixedAssetImpairmentFromRestructuring" abstract="false" name="FixedAssetImpairmentFromRestructuring" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_OtherComprehensiveIncomeLossDefinedBenefitPlansSettlementEffectsArisingDuringPeriodTax" abstract="false" name="OtherComprehensiveIncomeLossDefinedBenefitPlansSettlementEffectsArisingDuringPeriodTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_PerformanceVestingSharesOrUnitsDividendEquivalentsMember" abstract="true" name="PerformanceVestingSharesOrUnitsDividendEquivalentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ComputerHardwareAndSoftwareMember" abstract="true" name="ComputerHardwareAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_WeightedAverageSharesOutstandingAbstract" abstract="true" name="WeightedAverageSharesOutstandingAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_OtherCountriesMember" abstract="true" name="OtherCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_RestructuringAndRelatedActivitiesPeriodOfImplementation" abstract="false" name="RestructuringAndRelatedActivitiesPeriodOfImplementation" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wst_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect" abstract="false" name="AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentAndCumulativeChangesInNetGainLossFromCashFlowHedgesEffect" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_AmortizationExpenseImpactOnDilutedEarningsPerShare" abstract="false" name="AmortizationExpenseImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_StockSettledPSUAwardsMember" abstract="true" name="StockSettledPSUAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_PensionAndOtherPostretirementBenefitExpenseNet" abstract="false" name="PensionAndOtherPostretirementBenefitExpenseNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_PaymentOfExciseTaxesImpactOnDilutedEarningsShare" abstract="false" name="PaymentOfExciseTaxesImpactOnDilutedEarningsShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_RestructuringAndSeveranceRelatedCharges" abstract="false" name="RestructuringAndSeveranceRelatedCharges" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ProprietaryProductsMember" abstract="true" name="ProprietaryProductsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_NetSalesMember" abstract="true" name="NetSalesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_AwardTypesOtherThanStockOptionsAndStockAppreciationRightsMember" abstract="true" name="AwardTypesOtherThanStockOptionsAndStockAppreciationRightsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_IncomeTaxBenefitFromStockBasedCompensation" abstract="false" name="IncomeTaxBenefitFromStockBasedCompensation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_DefinedBenefitPlanAssumptionsUsedInCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsPercentageOfTotalPlanAssets" abstract="false" name="DefinedBenefitPlanAssumptionsUsedInCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssetsPercentageOfTotalPlanAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsAboveBelowTarget" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdjustmentsAboveBelowTarget" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_BrazilTaxRecovery" abstract="false" name="BrazilTaxRecovery" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisableNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_ForeignCurrencyDenominatedDebtMember" abstract="true" name="ForeignCurrencyDenominatedDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_SeniorBNotesDue2024Member" abstract="true" name="SeniorBNotesDue2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_DefinedBenefitPlanUltimateHealthCareCostTrendRateNetPeriodicBenefitCost" abstract="false" name="DefinedBenefitPlanUltimateHealthCareCostTrendRateNetPeriodicBenefitCost" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_PharmaRubberSADeCVMember" abstract="true" name="PharmaRubberSADeCVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_RatioOfDebtToEBITDA" abstract="false" name="RatioOfDebtToEBITDA" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="wst_SalesToEquityMethodInvestees" abstract="false" name="SalesToEquityMethodInvestees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ProbabilitiesOfSuccessfulExecutionOfAgreementMember" abstract="true" name="ProbabilitiesOfSuccessfulExecutionOfAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_CashSettledStockAppreciationRightsOutstanding" abstract="false" name="CashSettledStockAppreciationRightsOutstanding" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_TermLoanDue2024Member" abstract="true" name="TermLoanDue2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare" abstract="false" name="PaymentsToAcquireIntangibleAssetsImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_RevolvingCreditFacilityDue2024Member" abstract="true" name="RevolvingCreditFacilityDue2024Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare" abstract="false" name="RestructuringAndSeveranceRelatedChargesImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_Year2021Member" abstract="true" name="Year2021Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ProvisionForProductReturns" abstract="false" name="ProvisionForProductReturns" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_AccruedSalariesWagesAndBenefitsCurrent" abstract="false" name="AccruedSalariesWagesAndBenefitsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_OtherIncomeExpense" abstract="false" name="OtherIncomeExpense" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_SeniorNotesDue2022Member" abstract="true" name="SeniorNotesDue2022Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_SeniorCNotesDue2027Member" abstract="true" name="SeniorCNotesDue2027Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare" abstract="false" name="PensionSettlementAndRelatedChargesImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_EffectiveIncomeTaxRateReconciliationUndistributedEarningsOfSubsidiariesPercentage" abstract="false" name="EffectiveIncomeTaxRateReconciliationUndistributedEarningsOfSubsidiariesPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_OtherFinancialInstrumentsAbstract" abstract="true" name="OtherFinancialInstrumentsAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_LesseeLeaseCashFlowAndSupplementalInformationTableTextBlock" abstract="false" name="LesseeLeaseCashFlowAndSupplementalInformationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wst_OtherEuropeCountriesMember" abstract="true" name="OtherEuropeCountriesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_DeferredCompensationArrangementWithIndividualConversionUnit" abstract="false" name="DeferredCompensationArrangementWithIndividualConversionUnit" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_ScheduleOfChangesInFairValueOfPlanAssetsProjectedBenefitObligationsAndNetFundedStatusTableTextBlock" abstract="false" name="ScheduleOfChangesInFairValueOfPlanAssetsProjectedBenefitObligationsAndNetFundedStatusTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_DefinedBenefitPlanPlanAssetsContributionsByEmployerNetOfPremiums" abstract="false" name="DefinedBenefitPlanPlanAssetsContributionsByEmployerNetOfPremiums" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ScheduleOfIntangibleAssetsByMajorClassTable" abstract="true" name="ScheduleOfIntangibleAssetsByMajorClassTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="wst_ContractWithCustomerAssetIncreaseDecrease" abstract="false" name="ContractWithCustomerAssetIncreaseDecrease" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_GainLossOnArgentinaCurrencyDevaluation" abstract="false" name="GainLossOnArgentinaCurrencyDevaluation" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ExpirationPeriodAxis" abstract="true" name="ExpirationPeriodAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="wst_PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees" abstract="false" name="PurchasesAndRoyaltyPaymentsFromEquityMethodInvestees" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_IWPharmaGroupLLCMember" abstract="true" name="IWPharmaGroupLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ForeignCurrencyChargesFromDevaluationOfArgentinaCurrencyImpactOnDilutedEarningsPerShare" abstract="false" name="ForeignCurrencyChargesFromDevaluationOfArgentinaCurrencyImpactOnDilutedEarningsPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_ReductionInNumberOfSharesAvailableForGrantForEachAwardGranted" abstract="false" name="ReductionInNumberOfSharesAvailableForGrantForEachAwardGranted" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_ContingentConsiderationArrangementsRangeOfOutcomesPayablePeriod" abstract="false" name="ContingentConsiderationArrangementsRangeOfOutcomesPayablePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wst_SalesProjectionsMember" abstract="true" name="SalesProjectionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomeDeductionsFDIIPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncomeDeductionsFDIIPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_DebtInstrumentNumberOfTranches" abstract="false" name="DebtInstrumentNumberOfTranches" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="wst_DeferredCompensationArrangementWithIndividualShareEquivalentsBalance" abstract="false" name="DeferredCompensationArrangementWithIndividualShareEquivalentsBalance" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_DeferredStockUnitsPayableInCash" abstract="false" name="DeferredStockUnitsPayableInCash" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="wst_HighValueProductDeliveryDevicesMember" abstract="true" name="HighValueProductDeliveryDevicesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_OtherCurrentLiabilitiesAbstract" abstract="true" name="OtherCurrentLiabilitiesAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_ContractWithCustomerLiabilityRecognitionPeriod" abstract="false" name="ContractWithCustomerLiabilityRecognitionPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="wst_OtherExpenseIncomeAbstract" abstract="true" name="OtherExpenseIncomeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRateAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarningsNetOfForeignTaxCreditsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarningsNetOfForeignTaxCreditsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_DefinedBenefitPlanExpectedFutureBenefitPayments" abstract="false" name="DefinedBenefitPlanExpectedFutureBenefitPayments" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_SmartDoseMember" abstract="true" name="SmartDoseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod" abstract="false" name="ContractWithCustomerLiabilityRevenueRecognizedDuringThePeriod" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_PaymentOfExciseTaxes" abstract="false" name="PaymentOfExciseTaxes" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ForeignCurrencyChargesFromDevaluationOfArgentinaCurrency" abstract="false" name="ForeignCurrencyChargesFromDevaluationOfArgentinaCurrency" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_The2018RestructuringPlanMember" abstract="true" name="The2018RestructuringPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_AssetRelatedChargesMember" abstract="true" name="AssetRelatedChargesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRate" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="wst_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearNetPeriodicBenefitCost" abstract="false" name="DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYearNetPeriodicBenefitCost" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:percentItemType"/>
  <xs:element id="wst_AluplastSADeCVMember" abstract="true" name="AluplastSADeCVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_EmployeeStockPurchasePlanEsppMember" abstract="true" name="EmployeeStockPurchasePlanEsppMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_OtherComprehensiveLossDefinedBenefitPlansSettlementEffectsNetOfTax" abstract="false" name="OtherComprehensiveLossDefinedBenefitPlansSettlementEffectsNetOfTax" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_HighValueProductComponentsMember" abstract="true" name="HighValueProductComponentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_StockOptionAndAppreciationRightsMember" abstract="true" name="StockOptionAndAppreciationRightsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ScheduleOfOtherIncomeAndExpenseByComponentTableTextBlock" abstract="false" name="ScheduleOfOtherIncomeAndExpenseByComponentTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType"/>
  <xs:element id="wst_SouthKoreaDistributorMember" abstract="true" name="SouthKoreaDistributorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
  <xs:element id="wst_ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementsByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisesInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="num:perShareItemType"/>
  <xs:element id="wst_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringAndImpairmentCharges" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="wst_ScheduleOfIntangibleAssetsByMajorClassLineItems" abstract="true" name="ScheduleOfIntangibleAssetsByMajorClassLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="wst_PatentsAndLicensingMember" abstract="true" name="PatentsAndLicensingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="nonnum:domainItemType"/>
</xs:schema>
