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  <xsd:element abstract="true" id="sif_EuroInterbankOfferedRateEuriborMember" name="EuroInterbankOfferedRateEuriborMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sif_ForeignSubsidiaryBorrowingsMember" name="ForeignSubsidiaryBorrowingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_GainLossonDispositionofAssetsOrImpairmentofAssets" name="GainLossonDispositionofAssetsOrImpairmentofAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sif_IncomeTaxReconciliationEffectofLegislationandSaleofAssetsAmount" name="IncomeTaxReconciliationEffectofLegislationandSaleofAssetsAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="sif_LineOfCreditFacilityAccordionFeatureIncreaseLimit" name="LineOfCreditFacilityAccordionFeatureIncreaseLimit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sif_LineOfCreditFacilityAgreementTermsRequiredDebtRepaymentUsingProceedsFromAssetSale" name="LineOfCreditFacilityAgreementTermsRequiredDebtRepaymentUsingProceedsFromAssetSale" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="sif_LineOfCreditFacilityAvailabilityOfRevolvingCommitmentFixedChargeCoverageRatioThreshold" name="LineOfCreditFacilityAvailabilityOfRevolvingCommitmentFixedChargeCoverageRatioThreshold" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_LineofCreditFacilityCovenantTermsFixedChargeCoverageRatio" name="LineofCreditFacilityCovenantTermsFixedChargeCoverageRatio" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="sif_LineofCreditFacilityStockPledgedNonU.S.SubsidiariesPercentage" name="LineofCreditFacilityStockPledgedNonU.S.SubsidiariesPercentage" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_OtherNoncashLongtermLiabilities" name="OtherNoncashLongtermLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sif_OutstandingShareAwardsEarnedAndIssuedAtGreaterThanTargetNumberOfShares" name="OutstandingShareAwardsEarnedAndIssuedAtGreaterThanTargetNumberOfShares" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sif_PerformanceandRestrictedSharesMember" name="PerformanceandRestrictedSharesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_RestructuringCostsWorkforceReductionCostsIncurred" name="RestructuringCostsWorkforceReductionCostsIncurred" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sif_RestructuringCostsWorkforceReductionCostsPaid" name="RestructuringCostsWorkforceReductionCostsPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sif_SecondAmendmentAgreementMember" name="SecondAmendmentAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_ShareBasedCompensationNumberOfTranches" name="ShareBasedCompensationNumberOfTranches" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_ShareTransactionsUnderCompanyStockPlan" name="ShareTransactionsUnderCompanyStockPlan" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="sif_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNumberOfAwards" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsNumberOfAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_SharebasedCompensationArrangementbySharebasedPaymentAwardQualifyingfortheAwardPeriod" name="SharebasedCompensationArrangementbySharebasedPaymentAwardQualifyingfortheAwardPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="sif_TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpenseBenefit" name="TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxAssetProvisionalIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sif_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="sif_TwoThousandAndSixteenLongTermIncentivePlanMember" name="TwoThousandAndSixteenLongTermIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
