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  <xsd:element id="scl_ExpectedPaymentRelatedToNonqualifiedPlanInNextFiscalYear" name="ExpectedPaymentRelatedToNonqualifiedPlanInNextFiscalYear" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetChangeInUnrealizedGainLoss" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetChangeInUnrealizedGainLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisForeignExchangeImpact" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisForeignExchangeImpact" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_GoodwillImpairmentLossBeforeTax" name="GoodwillImpairmentLossBeforeTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_IncomeTaxReconciliationForeignTaxCreditExpenseBenefitRepatriationOfForeignEarnings" name="IncomeTaxReconciliationForeignTaxCreditExpenseBenefitRepatriationOfForeignEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_IncomeTaxReconciliationNondeductibleExpenseAndOtherItemsNet" name="IncomeTaxReconciliationNondeductibleExpenseAndOtherItemsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_IncomeTaxReconciliationStockBasedCompensationExcessTaxBenefits" name="IncomeTaxReconciliationStockBasedCompensationExcessTaxBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_IncomeTaxReconciliationUnrecognizedTaxBenefits" name="IncomeTaxReconciliationUnrecognizedTaxBenefits" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_IncreaseDecreaseInMarketPriceOfCommonStockDueToDeferredCompensation" name="IncreaseDecreaseInMarketPriceOfCommonStockDueToDeferredCompensation" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_IncreaseDecreaseInMarketValueOfCommonStock" name="IncreaseDecreaseInMarketValueOfCommonStock" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_IncreaseInDeferredCompensation" name="IncreaseInDeferredCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_IncreaseInMarketPriceOfCommonStockDueToDeferredCompensationLiabilities" name="IncreaseInMarketPriceOfCommonStockDueToDeferredCompensationLiabilities" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_InterestExpenseNetOfInterestIncome" name="InterestExpenseNetOfInterestIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_InterestRateContractsAssetsFairValueDisclosure" name="InterestRateContractsAssetsFairValueDisclosure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_LineOfCreditFacilityMaturityPeriod" name="LineOfCreditFacilityMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_LineOfCreditFacilityMaximumMaturityPeriod" name="LineOfCreditFacilityMaximumMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_LineOfCreditFacilityMinimumMaturityPeriod" name="LineOfCreditFacilityMinimumMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_LineOfCreditIncludingTermLoan" name="LineOfCreditIncludingTermLoan" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_LongTermDebtWithoutDeferredLoanExpenses" name="LongTermDebtWithoutDeferredLoanExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_LossContingencyClaimsReversedNumber" name="LossContingencyClaimsReversedNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_MaturityDateOfCurrentInterestSwapContract" name="MaturityDateOfCurrentInterestSwapContract" type="xbrli:dateItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_NoncashFinancingActivitiesIncludesSharesIssued" name="NoncashFinancingActivitiesIncludesSharesIssued" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_NoncashOrPartNoncashInvestingActivitiesPayablesIncurredForPropertyPlantAndEquipmentExpendituresUnpaid" name="NoncashOrPartNoncashInvestingActivitiesPayablesIncurredForPropertyPlantAndEquipmentExpendituresUnpaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_NotionalAmountOfUtilityContracts" name="NotionalAmountOfUtilityContracts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_NumberOfCountriesLeasesReside" name="NumberOfCountriesLeasesReside" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_NumberOfCustomersClaims" name="NumberOfCustomersClaims" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_NumberOfForeignSubsidiaries" name="NumberOfForeignSubsidiaries" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_NumberOfManufacturingSites" name="NumberOfManufacturingSites" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForDerivativesSecuritiesNetOfTax" name="OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForDerivativesSecuritiesNetOfTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_OtherRetirementObligation" name="OtherRetirementObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_PaymentOfEstimatedWorkingCapital" name="PaymentOfEstimatedWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_PaymentOfValueAddedTax" name="PaymentOfValueAddedTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_PaymentOfWorkingCapital" name="PaymentOfWorkingCapital" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_PaymentsForSiteContingencies" name="PaymentsForSiteContingencies" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_PaymentsToAcquireAssets" name="PaymentsToAcquireAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_PercentageOfDeferredCompensationLiblityRelatedToPerformanceCommonStock" name="PercentageOfDeferredCompensationLiblityRelatedToPerformanceCommonStock" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfExpectedLongTermRateOfReturnOnPlanAssets" name="PercentageOfExpectedLongTermRateOfReturnOnPlanAssets" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfLeaseAssetCategories" name="PercentageOfLeaseAssetCategories" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfLongTermReturnInCash" name="PercentageOfLongTermReturnInCash" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfPremiumEstimatedReturnForEquitiesAndPropertiesToRiskFreeRate" name="PercentageOfPremiumEstimatedReturnForEquitiesAndPropertiesToRiskFreeRate" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" name="PercentageOfUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfUSBasedUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" name="PercentageOfUSBasedUnionAndNonUnionEmployeesEligibleForEitherStatutoryOrCompanysSponsoredProfitSharingContributions" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PercentageOfValueOfLeasesReside" name="PercentageOfValueOfLeasesReside" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_PeriodicBenefitCostAndOtherComprehensiveIncome" name="PeriodicBenefitCostAndOtherComprehensiveIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_RemeasurementAdjustmentRelatedToTheTaxAct" name="RemeasurementAdjustmentRelatedToTheTaxAct" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_ResearchDevelopmentTechnicalServicesExpense" name="ResearchDevelopmentTechnicalServicesExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsCancelledInPeriodWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndModificationInPeriodWeightedAverageExercisePrice" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndModificationInPeriodWeightedAverageExercisePrice" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForForfeituresAndModificationInPeriod" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForForfeituresAndModificationInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_SiteContingencyMaximumFutureResponseCostPercentage" name="SiteContingencyMaximumFutureResponseCostPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_StockAppreciationRightsLiabilitiesNoncurrent" name="StockAppreciationRightsLiabilitiesNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_StockIssuedDuringPeriodValueShareBasedAndDeferredCompensation" name="StockIssuedDuringPeriodValueShareBasedAndDeferredCompensation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_StockRepurchasedDuringPeriodSharesRelatedToWithholdingTaxesOfCancellationOfRestrictedStock" name="StockRepurchasedDuringPeriodSharesRelatedToWithholdingTaxesOfCancellationOfRestrictedStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_SupplementalExecutiveRetirementPlanLiability" name="SupplementalExecutiveRetirementPlanLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_TaxBenefitRecognizedThresholdLimitPercentage" name="TaxBenefitRecognizedThresholdLimitPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_TaxCutsAndJobsActOf2017DeductionPercentageOfDividendsReceivedFromDistributionToEarningsPreviouslyTaxed" name="TaxCutsAndJobsActOf2017DeductionPercentageOfDividendsReceivedFromDistributionToEarningsPreviouslyTaxed" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_UnallocatedCorporateAssets" name="UnallocatedCorporateAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_UnallocatedCorporateDepreciationExpenses" name="UnallocatedCorporateDepreciationExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_UnallocatedCorporateExpenditures" name="UnallocatedCorporateExpenditures" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_UnallocatedCorporateExpense" name="UnallocatedCorporateExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_UnrecognizedTaxBenefitsIncreaseDecreasesResultingFromForeignCurrencyTranslation" name="UnrecognizedTaxBenefitsIncreaseDecreasesResultingFromForeignCurrencyTranslation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="scl_UnrestrictedRetainedEarnings" name="UnrestrictedRetainedEarnings" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="scl_VolumeDerivativeContract" name="VolumeDerivativeContract" type="dtr-types:energyItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="scl_InsuranceRecoveryLineItems" name="InsuranceRecoveryLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems" name="PensionPlansPostretirementAndOtherEmployeeBenefitsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ScheduleOfGeographicalSegmentsLineItems" name="ScheduleOfGeographicalSegmentsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SummaryOfSignificantAccountingPolicyLineItems" name="SummaryOfSignificantAccountingPolicyLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SupplementalCashFlowElementsLineItems" name="SupplementalCashFlowElementsLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_AcquisitionsMember" name="AcquisitionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_AllOtherCountriesMember" name="AllOtherCountriesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_AssetAndSparePartMember" name="AssetAndSparePartMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_BenefitObligationMember" name="BenefitObligationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ClariantMexicoMember" name="ClariantMexicoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ComputersEquipmentAndSoftwareMember" name="ComputersEquipmentAndSoftwareMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_CumulativeDecommissioningCostsMember" name="CumulativeDecommissioningCostsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_CustomerListsAndRelationshipsMember" name="CustomerListsAndRelationshipsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_DecommissioningCostsMember" name="DecommissioningCostsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_DefinedBenefitPlanPeriodicCostsMember" name="DefinedBenefitPlanPeriodicCostsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_DelayedDrawTermLoanCreditFacilityMember" name="DelayedDrawTermLoanCreditFacilityMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_DemandDepositsAndCertifatesOfDepositMember" name="DemandDepositsAndCertifatesOfDepositMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_EarlyTerminationOfLeaseExpensesMember" name="EarlyTerminationOfLeaseExpensesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_EmployeeStockOptionGrantedInTwoThousandAndSeventeenMember" name="EmployeeStockOptionGrantedInTwoThousandAndSeventeenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_EmployeeStockOptionGrantedPriorToTwoThousandAndSeventeenMember" name="EmployeeStockOptionGrantedPriorToTwoThousandAndSeventeenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_EquitySecuritiesPooledPensionFundsMember" name="EquitySecuritiesPooledPensionFundsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_FermentationPlantAcquisitionMember" name="FermentationPlantAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_FixedIncomePooledPensionFundsMember" name="FixedIncomePooledPensionFundsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_InsuranceContractsMember" name="InsuranceContractsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_INVISTAAromaticPolyesterPolyolBusinessAcquisitionMember" name="INVISTAAromaticPolyesterPolyolBusinessAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_KnowHowAndTrademarksMember" name="KnowHowAndTrademarksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_KnowHowMember" name="KnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_LaboratoryEquipmentMember" name="LaboratoryEquipmentMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_LegalConsultingValuationAndAccountingServicesMember" name="LegalConsultingValuationAndAccountingServicesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_LogosTechnologiesAssetAcquisitionMember" name="LogosTechnologiesAssetAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_LongfordMillsMember" name="LongfordMillsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_MultiCurrencyCreditFacilityWithSyndicateOfBanksMember" name="MultiCurrencyCreditFacilityWithSyndicateOfBanksMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_MultiCurrencyRevolvingCreditAgreementMember" name="MultiCurrencyRevolvingCreditAgreementMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_NanjingStepanJinlingChemicalLimitedLiabilityCompanyMember" name="NanjingStepanJinlingChemicalLimitedLiabilityCompanyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_NonUSSubsidiariesMember" name="NonUSSubsidiariesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_OilfieldDemulsifierProductLineMember" name="OilfieldDemulsifierProductLineMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_OpenMarketRepurchasesMember" name="OpenMarketRepurchasesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_OptionsAndStockAppreciationRightsMember" name="OptionsAndStockAppreciationRightsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_OtherReportingUnitsMember" name="OtherReportingUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_PerformanxSpecialtyChemicalsLlcMember" name="PerformanxSpecialtyChemicalsLlcMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_PhilippinesReportingUnitMember" name="PhilippinesReportingUnitMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_PolymersMember" name="PolymersMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ProductKnowHowMember" name="ProductKnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ProfitSharingContributionsMember" name="ProfitSharingContributionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_RailcarAndStorageTankLeasesMember" name="RailcarAndStorageTankLeasesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_RailcarsMember" name="RailcarsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_RetirementContributionsMember" name="RetirementContributionsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_RevolvingCreditFacilityAndTermLoanBorrowingMember" name="RevolvingCreditFacilityAndTermLoanBorrowingMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyOneANotesMember" name="SeriesTwoThousandAndTwentyOneANotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyOneBNotesMember" name="SeriesTwoThousandAndTwentyOneBNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyOneCNotesMember" name="SeriesTwoThousandAndTwentyOneCNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyOneDNotesMember" name="SeriesTwoThousandAndTwentyOneDNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyTwoANotesMember" name="SeriesTwoThousandAndTwentyTwoANotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SeriesTwoThousandAndTwentyTwoBNotesMember" name="SeriesTwoThousandAndTwentyTwoBNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SpecialtyProductsMember" name="SpecialtyProductsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StatutoryPlansMember" name="StatutoryPlansMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StockAppreciationRightsSARSGrantedInTwoThousandAndSeventeenMember" name="StockAppreciationRightsSARSGrantedInTwoThousandAndSeventeenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StockAppreciationRightsSARSGrantedPriorToTwoThousandAndSeventeenMember" name="StockAppreciationRightsSARSGrantedPriorToTwoThousandAndSeventeenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StockAwardPlanMember" name="StockAwardPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_StockAwardsMember" name="StockAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SupplyContractsMember" name="SupplyContractsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SurfactantsMember" name="SurfactantsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TechnologyAndManufacturingKnowHowMember" name="TechnologyAndManufacturingKnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TrademarksAndKnowHowMember" name="TrademarksAndKnowHowMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandAndNineteenAcquisitionMember" name="TwoThousandAndNineteenAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandAndTwentyAcquisitionMember" name="TwoThousandAndTwentyAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandAndTwentyOneAcquisitionMember" name="TwoThousandAndTwentyOneAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandEighteenRestructuringMember" name="TwoThousandEighteenRestructuringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandNineteenRestructuringMember" name="TwoThousandNineteenRestructuringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_TwoThousandSixteenRestructuringMember" name="TwoThousandSixteenRestructuringMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredBankDebtAndTermLoanInForeignCurrencyMember" name="UnsecuredBankDebtAndTermLoanInForeignCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredBankDebtInForeignCurrencyMember" name="UnsecuredBankDebtInForeignCurrencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesFiveMember" name="UnsecuredPrivatePlacementNotesFiveMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesFourMember" name="UnsecuredPrivatePlacementNotesFourMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesMember" name="UnsecuredPrivatePlacementNotesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesOneMember" name="UnsecuredPrivatePlacementNotesOneMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesSevenMember" name="UnsecuredPrivatePlacementNotesSevenMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesSixMember" name="UnsecuredPrivatePlacementNotesSixMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesThreeMember" name="UnsecuredPrivatePlacementNotesThreeMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_UnsecuredPrivatePlacementNotesTwoMember" name="UnsecuredPrivatePlacementNotesTwoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_USFixedIncomeSecuritiesMember" name="USFixedIncomeSecuritiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_WilmingtonSiteMember" name="WilmingtonSiteMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_InsuranceRecoveryTable" name="InsuranceRecoveryTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_PensionPlansPostretirementAndOtherEmployeeBenefitsTable" name="PensionPlansPostretirementAndOtherEmployeeBenefitsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_ScheduleOfGeographicalSegmentsTable" name="ScheduleOfGeographicalSegmentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SummaryOfSignificantAccountingPoliciesTable" name="SummaryOfSignificantAccountingPoliciesTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_SupplementalCashFlowElementsTable" name="SupplementalCashFlowElementsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="scl_AssetAcquisitionAndBusinessCombinationTextBlock" name="AssetAcquisitionAndBusinessCombinationTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_DeferredCompensationPolicyTextBlock" name="DeferredCompensationPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_NatureOfOperationsPolicyTextBlock" name="NatureOfOperationsPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_OperatingExpensesPolicyTextBlock" name="OperatingExpensesPolicyTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfDefinedBenefitPlanAmountsRecognizedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock" name="ScheduleOfDefinedBenefitPlanAmountsRecognizedInAccumulatedOtherComprehensiveIncomeLossTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfEntityWideDisclosureOnGeographicAreasTableTextBlock" name="ScheduleOfEntityWideDisclosureOnGeographicAreasTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfOperatingLeasesWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" name="ScheduleOfOperatingLeasesWeightedAverageRemainingLeaseTermAndDiscountRateTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="scl_ScheduleOfOtherLiabilitiesNoncurrentTableTextBlock" name="ScheduleOfOtherLiabilitiesNoncurrentTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
</xsd:schema>
