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  <xs:element id="shc_DepreciationAmortizationAndAdditions" abstract="false" name="DepreciationAmortizationAndAdditions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearFour" abstract="false" name="LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearFour" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_CustomerFourMember" abstract="true" name="CustomerFourMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_IncomeTaxHolidayIncomeTaxBenefit" abstract="false" name="IncomeTaxHolidayIncomeTaxBenefit" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_AccountsPayableAndAccruedLiabilitiesTable" abstract="true" name="AccountsPayableAndAccruedLiabilitiesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="shc_NumberOfCasesToBeStayed" abstract="false" name="NumberOfCasesToBeStayed" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="shc_PercentOfPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" abstract="false" name="PercentOfPropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <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_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionNonvestedAggregateIntrinsicValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionNonvestedAggregateIntrinsicValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_FinanceLeaseLiabilityMember" abstract="true" name="FinanceLeaseLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="shc_FinanceandOperatingLeaseLiabilitiesPaymentsDueAbstract" abstract="true" name="FinanceandOperatingLeaseLiabilitiesPaymentsDueAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="shc_ShareholdersEquityTable" abstract="true" name="ShareholdersEquityTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="shc_DebtInstrumentPrincipalBalancePaymentPercentOfAmountOutstanding" abstract="false" name="DebtInstrumentPrincipalBalancePaymentPercentOfAmountOutstanding" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="shc_RadioactiveIsotopeMember" abstract="true" name="RadioactiveIsotopeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_LesseeOperatingandFinanceLeaseLiabilityPaymentsDue" abstract="false" name="LesseeOperatingandFinanceLeaseLiabilityPaymentsDue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_SubsidiaryTwoMember" abstract="true" name="SubsidiaryTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_CustomerThreeMember" abstract="true" name="CustomerThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_WeightedAverageNumberOfSharesOutstanding1Abstract" abstract="true" name="WeightedAverageNumberOfSharesOutstanding1Abstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="shc_ScheduleOfShareBasedPaymentArrangementPreIPOAwardsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentArrangementPreIPOAwardsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="shc_GrossSettlementAndDefenseCostsIncurred" abstract="false" name="GrossSettlementAndDefenseCostsIncurred" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_RegulatoryComplianceAssociatesMember" abstract="true" name="RegulatoryComplianceAssociatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <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_PeriodOfActualFundingRequirements" abstract="false" name="PeriodOfActualFundingRequirements" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_DefinedBenefitPlanServiceCost1" abstract="false" name="DefinedBenefitPlanServiceCost1" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_PersonalInjuryMember" abstract="true" name="PersonalInjuryMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1: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_LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearTwo" abstract="false" name="LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearTwo" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_EthyleneOxideTortLitigationIllinoisMember" abstract="true" name="EthyleneOxideTortLitigationIllinoisMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_CookCountyMember" abstract="true" name="CookCountyMember" 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-types1: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_ScheduleOfShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsValuationAssumptionsTableTextBlock" abstract="false" name="ScheduleOfShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsValuationAssumptionsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="shc_LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearThree" abstract="false" name="LesseeOperatingandFinanceLeaseLiabilityPaymentsDueYearThree" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="shc_EthyleneOxideTortLitigationGeorgiaMember" abstract="true" name="EthyleneOxideTortLitigationGeorgiaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_PreIPOB2Member" abstract="true" name="PreIPOB2Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="shc_PeriodOfOptionToPurchase" abstract="false" name="PeriodOfOptionToPurchase" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="shc_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax" abstract="false" name="DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeLossDeferredIncomeTax" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
