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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2023 Workiva-->
<!--r:ad8fc090-fb30-4fe5-8090-619fa178a327,g:f136dd25-e364-4a4a-8c83-2b3eb55e5c68-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:shc="http://soterahealth.com/20230331" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2020-01-21" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://soterahealth.com/20230331">
  <xs:import namespace="http://fasb.org/srt/2022" schemaLocation="https://xbrl.fasb.org/srt/2022/elts/srt-2022.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2022" schemaLocation="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.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/2020-01-21" schemaLocation="https://www.xbrl.org/dtr/type/2020-01-21/types.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/dei/2022" schemaLocation="https://xbrl.sec.gov/dei/2022/dei-2022.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="shc-20230331_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="shc-20230331_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" 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="shc-20230331_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="shc-20230331_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="Cover" roleURI="http://soterahealth.com/role/Cover">
        <link:definition>0000001 - 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="ConsolidatedBalanceSheets" roleURI="http://soterahealth.com/role/ConsolidatedBalanceSheets">
        <link:definition>0000002 - 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://soterahealth.com/role/ConsolidatedBalanceSheetsParenthetical">
        <link:definition>0000003 - 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="ConsolidatedStatementsofOperationsandComprehensiveIncome" roleURI="http://soterahealth.com/role/ConsolidatedStatementsofOperationsandComprehensiveIncome">
        <link:definition>0000004 - Statement - Consolidated Statements of Operations and 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="ConsolidatedStatementsofOperationsandComprehensiveIncomeParenthetical" roleURI="http://soterahealth.com/role/ConsolidatedStatementsofOperationsandComprehensiveIncomeParenthetical">
        <link:definition>0000005 - Statement - Consolidated Statements of Operations and 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="ConsolidatedStatementsofCashFlows" roleURI="http://soterahealth.com/role/ConsolidatedStatementsofCashFlows">
        <link:definition>0000006 - 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="ConsolidatedStatementsofEquity" roleURI="http://soterahealth.com/role/ConsolidatedStatementsofEquity">
        <link:definition>0000007 - Statement - Consolidated Statements 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="BasisofPresentation" roleURI="http://soterahealth.com/role/BasisofPresentation">
        <link:definition>0000008 - Disclosure - Basis of Presentation</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="RecentAccountingStandards" roleURI="http://soterahealth.com/role/RecentAccountingStandards">
        <link:definition>0000009 - Disclosure - Recent 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="RevenueRecognition" roleURI="http://soterahealth.com/role/RevenueRecognition">
        <link:definition>0000010 - Disclosure - Revenue Recognition</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="Acquisitions" roleURI="http://soterahealth.com/role/Acquisitions">
        <link:definition>0000011 - Disclosure - Acquisitions</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="Inventories" roleURI="http://soterahealth.com/role/Inventories">
        <link:definition>0000012 - Disclosure - Inventories</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="PrepaidExpensesandOtherCurrentAssets" roleURI="http://soterahealth.com/role/PrepaidExpensesandOtherCurrentAssets">
        <link:definition>0000013 - Disclosure - Prepaid Expenses and Other Current 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="GoodwillandOtherIntangibleAssets" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssets">
        <link:definition>0000014 - Disclosure - Goodwill and Other 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="AccruedLiabilities" roleURI="http://soterahealth.com/role/AccruedLiabilities">
        <link:definition>0000015 - Disclosure - Accrued 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="LongTermDebt" roleURI="http://soterahealth.com/role/LongTermDebt">
        <link:definition>0000016 - Disclosure - Long-Term 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="IncomeTaxes" roleURI="http://soterahealth.com/role/IncomeTaxes">
        <link:definition>0000017 - 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="EmployeeBenefits" roleURI="http://soterahealth.com/role/EmployeeBenefits">
        <link:definition>0000018 - Disclosure - Employee Benefits</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="OtherComprehensiveIncomeLoss" roleURI="http://soterahealth.com/role/OtherComprehensiveIncomeLoss">
        <link:definition>0000019 - Disclosure - Other Comprehensive Income (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="ShareBasedCompensation" roleURI="http://soterahealth.com/role/ShareBasedCompensation">
        <link:definition>0000020 - Disclosure - Share-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="EarningsPerShare" roleURI="http://soterahealth.com/role/EarningsPerShare">
        <link:definition>0000021 - Disclosure - Earnings 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="CommitmentsandContingencies" roleURI="http://soterahealth.com/role/CommitmentsandContingencies">
        <link:definition>0000022 - 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="FinancialInstrumentsandFinancialRisk" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRisk">
        <link:definition>0000023 - Disclosure - Financial Instruments and Financial Risk</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://soterahealth.com/role/SegmentInformation">
        <link:definition>0000024 - 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="BasisofPresentationPolicies" roleURI="http://soterahealth.com/role/BasisofPresentationPolicies">
        <link:definition>0000025 - Disclosure - Basis of Presentation (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="RevenueRecognitionTables" roleURI="http://soterahealth.com/role/RevenueRecognitionTables">
        <link:definition>0000026 - Disclosure - Revenue Recognition (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="InventoriesTables" roleURI="http://soterahealth.com/role/InventoriesTables">
        <link:definition>0000027 - Disclosure - Inventories (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="PrepaidExpensesandOtherCurrentAssetsTables" roleURI="http://soterahealth.com/role/PrepaidExpensesandOtherCurrentAssetsTables">
        <link:definition>0000028 - Disclosure - Prepaid Expenses and Other Current 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="GoodwillandOtherIntangibleAssetsTables" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssetsTables">
        <link:definition>0000029 - Disclosure - Goodwill and Other 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="AccruedLiabilitiesTables" roleURI="http://soterahealth.com/role/AccruedLiabilitiesTables">
        <link:definition>0000030 - Disclosure - Accrued 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="LongTermDebtTables" roleURI="http://soterahealth.com/role/LongTermDebtTables">
        <link:definition>0000031 - Disclosure - Long-Term 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="EmployeeBenefitsTables" roleURI="http://soterahealth.com/role/EmployeeBenefitsTables">
        <link:definition>0000032 - Disclosure - Employee Benefits (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="OtherComprehensiveIncomeLossTables" roleURI="http://soterahealth.com/role/OtherComprehensiveIncomeLossTables">
        <link:definition>0000033 - Disclosure - Other Comprehensive Income (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="ShareBasedCompensationTables" roleURI="http://soterahealth.com/role/ShareBasedCompensationTables">
        <link:definition>0000034 - Disclosure - Share-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="EarningsPerShareTables" roleURI="http://soterahealth.com/role/EarningsPerShareTables">
        <link:definition>0000035 - Disclosure - Earnings 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="FinancialInstrumentsandFinancialRiskTables" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRiskTables">
        <link:definition>0000036 - Disclosure - Financial Instruments and Financial Risk (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="SegmentInformationTables" roleURI="http://soterahealth.com/role/SegmentInformationTables">
        <link:definition>0000037 - 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="BasisofPresentationDetails" roleURI="http://soterahealth.com/role/BasisofPresentationDetails">
        <link:definition>0000038 - Disclosure - Basis of Presentation (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="RevenueRecognitionDetails" roleURI="http://soterahealth.com/role/RevenueRecognitionDetails">
        <link:definition>0000039 - Disclosure - 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="AcquisitionsDetails" roleURI="http://soterahealth.com/role/AcquisitionsDetails">
        <link:definition>0000040 - Disclosure - Acquisitions (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="InventoriesDetails" roleURI="http://soterahealth.com/role/InventoriesDetails">
        <link:definition>0000041 - Disclosure - Inventories (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="PrepaidExpensesandOtherCurrentAssetsDetails" roleURI="http://soterahealth.com/role/PrepaidExpensesandOtherCurrentAssetsDetails">
        <link:definition>0000042 - Disclosure - Prepaid Expenses and Other Current 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="GoodwillandOtherIntangibleAssetsScheduleofGoodwillDetails" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssetsScheduleofGoodwillDetails">
        <link:definition>0000043 - Disclosure - Goodwill and Other Intangible Assets - Schedule of 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="GoodwillandOtherIntangibleAssetsScheduleofIntangibleAssetsDetails" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssetsScheduleofIntangibleAssetsDetails">
        <link:definition>0000044 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Intangible 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="GoodwillandOtherIntangibleAssetsNarrativeDetails" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails">
        <link:definition>0000045 - Disclosure - Goodwill and Other 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="GoodwillandOtherIntangibleAssetsScheduleofFutureAmortizationExpenseDetails" roleURI="http://soterahealth.com/role/GoodwillandOtherIntangibleAssetsScheduleofFutureAmortizationExpenseDetails">
        <link:definition>0000046 - Disclosure - Goodwill and Other Intangible Assets - Schedule of Future Amortization 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="AccruedLiabilitiesDetails" roleURI="http://soterahealth.com/role/AccruedLiabilitiesDetails">
        <link:definition>0000047 - Disclosure - Accrued 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="LongTermDebtScheduleofLongtermDebtInstrumentsDetails" roleURI="http://soterahealth.com/role/LongTermDebtScheduleofLongtermDebtInstrumentsDetails">
        <link:definition>0000048 - Disclosure - Long-Term Debt - Schedule of Long-term Debt 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="LongTermDebtScheduleofLongtermDebtInstrumentsDetails_1" roleURI="http://soterahealth.com/role/LongTermDebtScheduleofLongtermDebtInstrumentsDetails_1">
        <link:definition>0000048 - Disclosure - Long-Term Debt - Schedule of Long-term Debt 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="LongTermDebtSeniorSecuredCreditFacilitiesNarrativeDetails" roleURI="http://soterahealth.com/role/LongTermDebtSeniorSecuredCreditFacilitiesNarrativeDetails">
        <link:definition>0000049 - Disclosure - Long-Term Debt - Senior Secured Credit Facilities (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="LongTermDebtFirstLienNotesNarrativeDetails" roleURI="http://soterahealth.com/role/LongTermDebtFirstLienNotesNarrativeDetails">
        <link:definition>0000050 - Disclosure - Long-Term Debt - First Lien Notes (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="LongTermDebtScheduleofMaturitiesofLongtermDebtDetails" roleURI="http://soterahealth.com/role/LongTermDebtScheduleofMaturitiesofLongtermDebtDetails">
        <link:definition>0000051 - Disclosure - Long-Term Debt - Schedule of Maturities of Long-term 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="IncomeTaxesDetails" roleURI="http://soterahealth.com/role/IncomeTaxesDetails">
        <link:definition>0000052 - Disclosure - 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="EmployeeBenefitsScheduleofNetPeriodicBenefitCostsDetails" roleURI="http://soterahealth.com/role/EmployeeBenefitsScheduleofNetPeriodicBenefitCostsDetails">
        <link:definition>0000053 - Disclosure - Employee Benefits - Schedule of Net Periodic Benefit 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="EmployeeBenefitsNarrativeDetails" roleURI="http://soterahealth.com/role/EmployeeBenefitsNarrativeDetails">
        <link:definition>0000054 - Disclosure - Employee Benefits - 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="OtherComprehensiveIncomeLossDetails" roleURI="http://soterahealth.com/role/OtherComprehensiveIncomeLossDetails">
        <link:definition>0000055 - Disclosure - 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="ShareBasedCompensationNarrativeDetails" roleURI="http://soterahealth.com/role/ShareBasedCompensationNarrativeDetails">
        <link:definition>0000056 - Disclosure - Share-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="ShareBasedCompensationScheduleofNonvestedRestrictedStockUnitsActivityDetails" roleURI="http://soterahealth.com/role/ShareBasedCompensationScheduleofNonvestedRestrictedStockUnitsActivityDetails">
        <link:definition>0000057 - Disclosure - Share-Based Compensation - Schedule of Nonvested Restricted Stock Units 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="ShareBasedCompensationScheduleofStockOptionActivityDetails" roleURI="http://soterahealth.com/role/ShareBasedCompensationScheduleofStockOptionActivityDetails">
        <link:definition>0000058 - Disclosure - Share-Based Compensation - Schedule of Stock Option 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="ShareBasedCompensationScheduleofRestrictedStockActivityDetails" roleURI="http://soterahealth.com/role/ShareBasedCompensationScheduleofRestrictedStockActivityDetails">
        <link:definition>0000059 - Disclosure - Share-Based Compensation - Schedule of Restricted Stock 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="EarningsPerShareDetails" roleURI="http://soterahealth.com/role/EarningsPerShareDetails">
        <link:definition>0000060 - Disclosure - Earnings 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="CommitmentsandContingenciesDetails" roleURI="http://soterahealth.com/role/CommitmentsandContingenciesDetails">
        <link:definition>0000061 - 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="FinancialInstrumentsandFinancialRiskNarrativeDetails" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRiskNarrativeDetails">
        <link:definition>0000062 - Disclosure - Financial Instruments and Financial Risk - 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="FinancialInstrumentsandFinancialRiskScheduleofDerivativeInstrumentsDetails" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRiskScheduleofDerivativeInstrumentsDetails">
        <link:definition>0000063 - Disclosure - Financial Instruments and Financial Risk - Schedule of Derivative 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="FinancialInstrumentsandFinancialRiskScheduleofDerivativeInstrumentsGainLossDetails" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRiskScheduleofDerivativeInstrumentsGainLossDetails">
        <link:definition>0000064 - Disclosure - Financial Instruments and Financial Risk - Schedule of Derivative Instruments, Gain (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="FinancialInstrumentsandFinancialRiskScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails" roleURI="http://soterahealth.com/role/FinancialInstrumentsandFinancialRiskScheduleofFairValueAssetsandLiabilitiesMeasuredonRecurringBasisDetails">
        <link:definition>0000065 - Disclosure - Financial Instruments and Financial Risk - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (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="SegmentInformationNarrativeDetails" roleURI="http://soterahealth.com/role/SegmentInformationNarrativeDetails">
        <link:definition>0000066 - 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="SegmentInformationScheduleofSegmentReportingInformationbySegmentDetails" roleURI="http://soterahealth.com/role/SegmentInformationScheduleofSegmentReportingInformationbySegmentDetails">
        <link:definition>0000067 - Disclosure - Segment Information - Schedule of Segment Reporting Information, by Segment (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="SegmentInformationScheduleofReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails" roleURI="http://soterahealth.com/role/SegmentInformationScheduleofReconciliationofOperatingProfitLossfromSegmentstoConsolidatedDetails">
        <link:definition>0000068 - Disclosure - Segment Information - Schedule of Reconciliation of Operating Profit (Loss) from Segments to Consolidated (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="shc_AccruedInterestExpenseCurrent" abstract="false" name="AccruedInterestExpenseCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_DerivativeOptionPremium" abstract="false" name="DerivativeOptionPremium" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_SealedSourceAndSupplyAgreementsMember" abstract="true" name="SealedSourceAndSupplyAgreementsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_DebtInstrumentPrepaymentPeriodWithoutPenalty" abstract="false" name="DebtInstrumentPrepaymentPeriodWithoutPenalty" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_PreIPOB2Member" abstract="true" name="PreIPOB2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_GwinnettCountyMember" abstract="true" name="GwinnettCountyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_EthyleneOxideTortLitigationGeorgiaMember" abstract="true" name="EthyleneOxideTortLitigationGeorgiaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_RegulatoryComplianceAssociatesIncRCAMember" abstract="true" name="RegulatoryComplianceAssociatesIncRCAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_AmortizationOfIntangibleAssetsNonProductionMember" abstract="true" name="AmortizationOfIntangibleAssetsNonProductionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_TermLoanMember" abstract="true" name="TermLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LettersOfCreditSolvencyPaymentAsPercentOfMarketValue" abstract="false" name="LettersOfCreditSolvencyPaymentAsPercentOfMarketValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="shc_CustomerFiveMember" abstract="true" name="CustomerFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_CompensatoryDamagesMemberMember" abstract="true" name="CompensatoryDamagesMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PreIPOB1Member" abstract="true" name="PreIPOB1Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_DebtInstrumentTriggeringPeriodForDefault" abstract="false" name="DebtInstrumentTriggeringPeriodForDefault" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndAfterTax" abstract="false" name="OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndAfterTax" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_TriggeringEventAxis" abstract="true" name="TriggeringEventAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="shc_EthyleneOxideTortLitigationIllinoisMember" abstract="true" name="EthyleneOxideTortLitigationIllinoisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PrepaidMaintenanceContractsCurrent" abstract="false" name="PrepaidMaintenanceContractsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_OtherLongTermDebtMember" abstract="true" name="OtherLongTermDebtMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LongTermDebtMaturityAfterYearFour" abstract="false" name="LongTermDebtMaturityAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_NumberOfDaysToClaimantReceivesAllDisclosureMinimum" abstract="false" name="NumberOfDaysToClaimantReceivesAllDisclosureMinimum" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_LossContingencyNumberOfIndividualsThreatenedToFileLawsuits" abstract="false" name="LossContingencyNumberOfIndividualsThreatenedToFileLawsuits" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="shc_CustomerTwoMember" abstract="true" name="CustomerTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_ShareBasedPaymentArrangementTrancheFourMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiabilityPerOccurrence" abstract="false" name="LossContingencyUndiscountedAmountOfInsuranceRelatedAssessmentLiabilityPerOccurrence" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_CoDefendantMemberMember" abstract="true" name="CoDefendantMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_RealEstateDamageMember" abstract="true" name="RealEstateDamageMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_CustomerFourMember" abstract="true" name="CustomerFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PercentOfReturnOnInvestments" abstract="false" name="PercentOfReturnOnInvestments" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="shc_DebtInstrumentPrincipalBalancePaymentPercentOfAmountOutstanding" abstract="false" name="DebtInstrumentPrincipalBalancePaymentPercentOfAmountOutstanding" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="shc_LongTermDebtCurrentMaturitiesGross" abstract="false" name="LongTermDebtCurrentMaturitiesGross" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_PunitiveDamagesMemberMember" abstract="true" name="PunitiveDamagesMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PercentOfBorrowingLimitationDueToCashFlowExposure" abstract="false" name="PercentOfBorrowingLimitationDueToCashFlowExposure" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="shc_LicensingAgreementsRenewalTerm" abstract="false" name="LicensingAgreementsRenewalTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_A2020OmnibusIncentivePlanMember" abstract="true" name="A2020OmnibusIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PaymentsToAcquireBusinessesNetOfCashAcquiredAdjustments" abstract="false" name="PaymentsToAcquireBusinessesNetOfCashAcquiredAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_PECMemberMember" abstract="true" name="PECMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" abstract="false" name="FiniteLivedIntangibleAssetExpectedAmortizationAfterYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_LandUseRightsMember" abstract="true" name="LandUseRightsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_TermLoanDue2026Member" abstract="true" name="TermLoanDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_SeniorSecuredCreditFacilitiesMember" abstract="true" name="SeniorSecuredCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LongTermDebtGrossNoncurrent" abstract="false" name="LongTermDebtGrossNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_TermLoanBDue2026Member" abstract="true" name="TermLoanBDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_AcquisitionAndDivestitureRelatedChargesNet" abstract="false" name="AcquisitionAndDivestitureRelatedChargesNet" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_NordionMember" abstract="true" name="NordionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_UnnamedEBeamJointVentureMember" abstract="true" name="UnnamedEBeamJointVentureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_AmortizationOfIntangibleAssetsNonproduction" abstract="false" name="AmortizationOfIntangibleAssetsNonproduction" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodFairValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableInPeriodFairValue" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_DebtInstrumentBaseAmountForDefault" abstract="false" name="DebtInstrumentBaseAmountForDefault" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_IotronIndustriesCanadaIncIotronMember" abstract="true" name="IotronIndustriesCanadaIncIotronMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_SegmentIncomeLoss" abstract="false" name="SegmentIncomeLoss" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_CustomerThreeMember" abstract="true" name="CustomerThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_FirstLienNotesDue2026Member" abstract="true" name="FirstLienNotesDue2026Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_PrepaidSoftwareLicensingCurrent" abstract="false" name="PrepaidSoftwareLicensingCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_NelsonLabsMember" abstract="true" name="NelsonLabsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_AuraluxMember" abstract="true" name="AuraluxMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_EligibleClaimantsPercentage" abstract="false" name="EligibleClaimantsPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="shc_FinanceLeaseLiabilityMember" abstract="true" name="FinanceLeaseLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_CustomerOneMember" abstract="true" name="CustomerOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LossContingencyClaimsScheduledForTrialsNumber" abstract="false" name="LossContingencyClaimsScheduledForTrialsNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="shc_CancellationFeeReceivedForLeaseTermination" abstract="false" name="CancellationFeeReceivedForLeaseTermination" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_DebtInstrumentUnamortizedDiscountExcludingCurrentPortion" abstract="false" name="DebtInstrumentUnamortizedDiscountExcludingCurrentPortion" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_ShareBasedPaymentArrangementTrancheFiveMember" abstract="true" name="ShareBasedPaymentArrangementTrancheFiveMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_InjuryMember" abstract="true" name="InjuryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_LossContingencyConsolidatedClaimsNumber" abstract="false" name="LossContingencyConsolidatedClaimsNumber" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="shc_SterigenicsMember" abstract="true" name="SterigenicsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_ForwardStartDateBeginningOnJuly312023Member" abstract="true" name="ForwardStartDateBeginningOnJuly312023Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_TriggeringEventDomain" abstract="true" name="TriggeringEventDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_CostAndExpensesCOVID19" abstract="false" name="CostAndExpensesCOVID19" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_LitigationSettlementReserveCurrent" abstract="false" name="LitigationSettlementReserveCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_DefinedBenefitPlanAnnualFundingRequirementsForNextFiveYears" abstract="false" name="DefinedBenefitPlanAnnualFundingRequirementsForNextFiveYears" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_LongTermDebtCurrentMaturitiesFairValue" abstract="false" name="LongTermDebtCurrentMaturitiesFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_AssetTransferCaseMemberMember" abstract="true" name="AssetTransferCaseMemberMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="shc_ForeignCurrencyGainLossAndGainLossOnEmbeddedDerivative" abstract="false" name="ForeignCurrencyGainLossAndGainLossOnEmbeddedDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_NumberOfConsolidatedCases" abstract="false" name="NumberOfConsolidatedCases" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
</xs:schema>
