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  <xsd:element name="FiniteLivedIntangibleAssetsWrittenOff" id="chmt_FiniteLivedIntangibleAssetsWrittenOff" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDebtInstrumentsTable" id="chmt_ScheduleOfDebtInstrumentsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentVariableRateBaseDomain" id="chmt_DebtInstrumentVariableRateBaseDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentIssuePriceAsPercentageOfFaceValue" id="chmt_DebtInstrumentIssuePriceAsPercentageOfFaceValue" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentDiscountRatePercentage" id="chmt_DebtInstrumentDiscountRatePercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentBorrowingCapacityAvailableIncrease" id="chmt_DebtInstrumentBorrowingCapacityAvailableIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityTerm" id="chmt_LineOfCreditFacilityTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityMaximumBorrowingCapacityForLettersOfCredit" id="chmt_LineOfCreditFacilityMaximumBorrowingCapacityForLettersOfCredit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="LineOfCreditFacilityBorrowingCapacityAvailableIncrease" id="chmt_LineOfCreditFacilityBorrowingCapacityAvailableIncrease" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentCovenantSecuredLeverageRatio" id="chmt_DebtInstrumentCovenantSecuredLeverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentCovenantConsolidatedInterestCoverageRatio" id="chmt_DebtInstrumentCovenantConsolidatedInterestCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentCovenantTrailingPeriodUsedForCalculationOfFixedChargeCoverageRatio" id="chmt_DebtInstrumentCovenantTrailingPeriodUsedForCalculationOfFixedChargeCoverageRatio" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantFixedChargeCoverageRatio" id="chmt_DebtInstrumentCovenantFixedChargeCoverageRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentCovenantThresholdAmountForMaintenanceOfSpecifiedFixedChargeCoverageRatio" id="chmt_DebtInstrumentCovenantThresholdAmountForMaintenanceOfSpecifiedFixedChargeCoverageRatio" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="DebtInstrumentCovenantThresholdPercentageOfAggregateCommitmentsForMaintenanceOfSpecifiedFixedChargeCoverageRatio" id="chmt_DebtInstrumentCovenantThresholdPercentageOfAggregateCommitmentsForMaintenanceOfSpecifiedFixedChargeCoverageRatio" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DebtInstrumentCovenantCompliancePercentageOfAggregateCommitmentsMaintenanceConsecutiveDaysNumber" id="chmt_DebtInstrumentCovenantCompliancePercentageOfAggregateCommitmentsMaintenanceConsecutiveDaysNumber" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardExpirationPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodApproved" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodApproved" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMultiplierForGrants" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMultiplierForGrants" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMeasurementPeriod" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceMeasurementPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodApproved" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodApproved" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VestingRightsPercentage" id="chmt_VestingRightsPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributionPercentage" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributionPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributedInPeriod" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsDistributedInPeriod" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlanCashContributionsByForeignSubsidiary" id="chmt_DefinedBenefitPlanCashContributionsByForeignSubsidiary" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlanPeriodForMakingPensionContributionsByForeignSubsidiary" id="chmt_DefinedBenefitPlanPeriodForMakingPensionContributionsByForeignSubsidiary" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlanCashContributionsByEntity" id="chmt_DefinedBenefitPlanCashContributionsByEntity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DefinedBenefitPlanNumberOfPlansAgainstWhichNoticeWasIssuedForFinancialSupportDirection" id="chmt_DefinedBenefitPlanNumberOfPlansAgainstWhichNoticeWasIssuedForFinancialSupportDirection" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfAssetRetirementObligationsTable" id="chmt_ScheduleOfAssetRetirementObligationsTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationFacilityClosureDomain" id="chmt_AssetRetirementObligationFacilityClosureDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationLineItems" id="chmt_AssetRetirementObligationLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationClosureOfFacilitiesNumber" id="chmt_AssetRetirementObligationClosureOfFacilitiesNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationAccretionExpenseCostOfGoodsSold" id="chmt_AssetRetirementObligationAccretionExpenseCostOfGoodsSold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationReclassifications" id="chmt_AssetRetirementObligationReclassifications" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="AssetRetirementObligationAssetsBookValue" id="chmt_AssetRetirementObligationAssetsBookValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="AccessToNumberOfCommercializedProducts" id="chmt_AccessToNumberOfCommercializedProducts" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentOwnershipInterestPercentage" id="chmt_EquityMethodInvestmentOwnershipInterestPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentsAnnualContributionAgreedToFundDiscoveryAndDevelopmentFromEachPartner" id="chmt_EquityMethodInvestmentsAnnualContributionAgreedToFundDiscoveryAndDevelopmentFromEachPartner" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentsPeriodForContributionToFundDiscoveryAndDevelopment" id="chmt_EquityMethodInvestmentsPeriodForContributionToFundDiscoveryAndDevelopment" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentsContributionToFundDiscoveryAndDevelopment" id="chmt_EquityMethodInvestmentsContributionToFundDiscoveryAndDevelopment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentsCashContribution" id="chmt_EquityMethodInvestmentsCashContribution" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="PeriodForReceivingProceedsFromDivestitureOfInterestInJointVentureInAnnualInstallments" id="chmt_PeriodForReceivingProceedsFromDivestitureOfInterestInJointVentureInAnnualInstallments" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRemainingAnnualInstallmentsForReceivingProceedsFromDivestitureOfInterestInJointVenture" id="chmt_NumberOfRemainingAnnualInstallmentsForReceivingProceedsFromDivestitureOfInterestInJointVenture" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyProceedingsNumberOfAffiliateEntitiesIncludedInBankruptcyFiling" id="chmt_BankruptcyProceedingsNumberOfAffiliateEntitiesIncludedInBankruptcyFiling" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BankruptcyProceedingsDistributableClaimReserveDisclosureTable" id="chmt_BankruptcyProceedingsDistributableClaimReserveDisclosureTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ClaimReserveDomain" id="chmt_ClaimReserveDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyProceedingsDistributableClaimReserveDisclosureLineItems" id="chmt_BankruptcyProceedingsDistributableClaimReserveDisclosureLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsDistributableBalanceAmount" id="chmt_BankruptcyClaimsDistributableBalanceAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsSupplementalDistributionToHoldersOfInterestsInCash" id="chmt_BankruptcyClaimsSupplementalDistributionToHoldersOfInterestsInCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsDecreaseInReserveDueToSettlements" id="chmt_BankruptcyClaimsDecreaseInReserveDueToSettlements" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsSupplementalDistributionToHoldersOfInterestsInStock" id="chmt_BankruptcyClaimsSupplementalDistributionToHoldersOfInterestsInStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsDecreaseInReserveDueToSupplementalDistributions" id="chmt_BankruptcyClaimsDecreaseInReserveDueToSupplementalDistributions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyProceedingsNumberOfFullyAdministeredDebtors" id="chmt_BankruptcyProceedingsNumberOfFullyAdministeredDebtors" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BankruptcyClaimsReserveBalanceApproved" id="chmt_BankruptcyClaimsReserveBalanceApproved" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="EnvironmentalLiabilitiesThatHaveNotBeenDischargedOrSettledAbstract" id="chmt_EnvironmentalLiabilitiesThatHaveNotBeenDischargedOrSettledAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SiteContingencyPeriodForAccrualOfCostsOnUndiscountedBasis" id="chmt_SiteContingencyPeriodForAccrualOfCostsOnUndiscountedBasis" type="xbrli:durationItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="DischargedAndOrSettledEnvironmentalLiabilitiesAbstract" id="chmt_DischargedAndOrSettledEnvironmentalLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencySettlementPaid" id="chmt_LossContingencySettlementPaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="FinancingAgreementsWithNumberOfBanks" id="chmt_FinancingAgreementsWithNumberOfBanks" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfMajorProductLines" id="chmt_NumberOfMajorProductLines" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SegmentOperatingProfitLoss" id="chmt_SegmentOperatingProfitLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="GeneralCorporateExpense" id="chmt_GeneralCorporateExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IncomeLossOfSubsidiariesFromContinuingOperations" id="chmt_IncomeLossOfSubsidiariesFromContinuingOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="OtherLongTermLiability" id="chmt_OtherLongTermLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="OtherAssetNoncurrent" id="chmt_OtherAssetNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="EquityIncomeLoss" id="chmt_EquityIncomeLoss" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ContractualInterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations" id="chmt_ContractualInterestExpenseOnPrepetitionLiabilitiesRecognizedInStatementOfOperations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CancellationOfPreviouslyIssuedCommonStockValue" id="chmt_CancellationOfPreviouslyIssuedCommonStockValue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="CancellationOfPreviouslyIssuedCommonStockShares" id="chmt_CancellationOfPreviouslyIssuedCommonStockShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfAccountsReceivableDisclosureAbstract" id="chmt_SaleOfAccountsReceivableDisclosureAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SaleOfAccountsReceivableTextBlock" id="chmt_SaleOfAccountsReceivableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrepetitionLitigationAndClaimsDischargedMember" id="chmt_PrepetitionLitigationAndClaimsDischargedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TricorRefiningLLCMember" id="chmt_TricorRefiningLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ConyersWarehouseLitigationMember" id="chmt_ConyersWarehouseLitigationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyLawsuitsPendingNumber" id="chmt_LossContingencyLawsuitsPendingNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DiacetylLitigationMember" id="chmt_DiacetylLitigationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WrightRubberProductsPtyLtdMember" id="chmt_WrightRubberProductsPtyLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyNewClaimsFiledByIndividualsNumber" id="chmt_LossContingencyNewClaimsFiledByIndividualsNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PentairWaterPoolAndSpaIncMember" id="chmt_PentairWaterPoolAndSpaIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyNewClaimsFiledByCorporateResellersOrUsersNumber" id="chmt_LossContingencyNewClaimsFiledByCorporateResellersOrUsersNumber" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyInsuranceRecoveryPercentage" id="chmt_LossContingencyInsuranceRecoveryPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="BankruptcyClaimsNumberOfCourtOrdersAppealed" id="chmt_BankruptcyClaimsNumberOfCourtOrdersAppealed" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AccountsReceivableFactoringFacilityMember" id="chmt_AccountsReceivableFactoringFacilityMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfCompensationUnderThePlanWithheldForPurchaseOfShares" id="chmt_PercentageOfCompensationUnderThePlanWithheldForPurchaseOfShares" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PercentageOfAverageOfHighAndLowCommonStockSalePrices" id="chmt_PercentageOfAverageOfHighAndLowCommonStockSalePrices" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfferingPerPeriodNumber" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfferingPerPeriodNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfferingPerPlanYearNumber" id="chmt_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesOfferingPerPlanYearNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="DefinedBenefitPlanIncreaseInProjectedBenefitObligation" id="chmt_DefinedBenefitPlanIncreaseInProjectedBenefitObligation" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="NumberOfForeignCurrencyDerivatives" id="chmt_NumberOfForeignCurrencyDerivatives" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PaymentsForEnvironmentalAllegedPenalty" id="chmt_PaymentsForEnvironmentalAllegedPenalty" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="SeveranceAndOtherFacilityClosureCosts" id="chmt_SeveranceAndOtherFacilityClosureCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RecordedSeveranceAcceleratedDepreciationAssetRetirementAndOtherCharges" id="chmt_RecordedSeveranceAcceleratedDepreciationAssetRetirementAndOtherCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ReceivableWriteOffMember" id="chmt_ReceivableWriteOffMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestructuringReservePeriodExpenses" id="chmt_RestructuringReservePeriodExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="DisposalGroupNotDiscontinuedOperationsSalePrice" id="chmt_DisposalGroupNotDiscontinuedOperationsSalePrice" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="DisposalGroupNotDiscontinuedOperationsAnnualInstallmentsToBeReceived" id="chmt_DisposalGroupNotDiscontinuedOperationsAnnualInstallmentsToBeReceived" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="BusinessTransferAgreementMember" id="chmt_BusinessTransferAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityMethodInvestmentsCashConsideration" id="chmt_EquityMethodInvestmentsCashConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="DebtorReorganizationItemsSeveranceCosts" id="chmt_DebtorReorganizationItemsSeveranceCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ImpairmentOfPropertyPlantAndEquipment" id="chmt_ImpairmentOfPropertyPlantAndEquipment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
</xsd:schema>
