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  <xs:element id="sols_DebtInstrumentCovenantTotalLeverageRatioMaximum" abstract="false" name="DebtInstrumentCovenantTotalLeverageRatioMaximum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sols_DebtInstrumentCovenantTotalLeverageRatioStepUpFollowingAcquisition" abstract="false" name="DebtInstrumentCovenantTotalLeverageRatioStepUpFollowingAcquisition" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sols_DebtInstrumentCovenantInterestCoverageRatioMinimum" abstract="false" name="DebtInstrumentCovenantInterestCoverageRatioMinimum" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="sols_DebtInstrumentMaintenanceFeePercentage" abstract="false" name="DebtInstrumentMaintenanceFeePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sols_AccruedCustomerRebatesCurrent" abstract="false" name="AccruedCustomerRebatesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_PensionAndOtherEmployeeRelatedLiabilitiesNoncurrent" abstract="false" name="PensionAndOtherEmployeeRelatedLiabilitiesNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_A2025PlanMember" abstract="true" name="A2025PlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_MultiemployerPlanServiceCost" abstract="false" name="MultiemployerPlanServiceCost" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_DefinedBenefitPlanBenefitObligationActuarialGainLossChangesInFinancialAssumptions" abstract="false" name="DefinedBenefitPlanBenefitObligationActuarialGainLossChangesInFinancialAssumptions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCost" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostServiceCost" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sols_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCost" abstract="false" name="DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostInterestCost" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sols_DefinedBenefitPlanCashAndShortTermInvestmentsMember" abstract="true" name="DefinedBenefitPlanCashAndShortTermInvestmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_DefinedBenefitPlanAssetTransferFromSpinoffMember" abstract="true" name="DefinedBenefitPlanAssetTransferFromSpinoffMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_AsahiSchwebelJVMember" abstract="true" name="AsahiSchwebelJVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_QuimobasicosJVMember" abstract="true" name="QuimobasicosJVMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_SinochemLantianNewMaterialsCo.Ltd.Member" abstract="true" name="SinochemLantianNewMaterialsCo.Ltd.Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_DelawareValleyWorksFacilityMember" abstract="true" name="DelawareValleyWorksFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_AmherstburgOntarioCanadaMember" abstract="true" name="AmherstburgOntarioCanadaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_SeelzeGermanyMember" abstract="true" name="SeelzeGermanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_AllOtherSitesMember" abstract="true" name="AllOtherSitesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_EnvironmentalLossContingenciesNumberOfOtherSites" abstract="false" name="EnvironmentalLossContingenciesNumberOfOtherSites" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sols_AESFacilityMember" abstract="true" name="AESFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_PersonalInjuryCaseMember" abstract="true" name="PersonalInjuryCaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_EnvironmentalLossContingenciesNumberOfSites" abstract="false" name="EnvironmentalLossContingenciesNumberOfSites" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="sols_AssetRetirementObligationsRiskFreeRate" abstract="false" name="AssetRetirementObligationsRiskFreeRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="sols_EarningsBeforeInterestTaxDepreciationAndAmortization" abstract="false" name="EarningsBeforeInterestTaxDepreciationAndAmortization" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_EarningsBeforeInterestTaxDepreciationAndAmortizationNetOfCorporateNonsegmentAdjustments" abstract="false" name="EarningsBeforeInterestTaxDepreciationAndAmortizationNetOfCorporateNonsegmentAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="sols_OtherInternationalMember" abstract="true" name="OtherInternationalMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="sols_ExportSalesIncludedInNetSalesOfUnitedStates" abstract="false" name="ExportSalesIncludedInNetSalesOfUnitedStates" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
</xs:schema>
