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    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_69B9D1DB16122DD54CF341A795801888_totalLabel_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_69B9D1DB16122DD54CF341A795801888" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Comprehensive loss</link:label>
    <link:label id="lab_us-gaap_ComprehensiveIncomeNetOfTax_69B9D1DB16122DD54CF341A795801888_label_en-US" xlink:label="lab_us-gaap_ComprehensiveIncomeNetOfTax_69B9D1DB16122DD54CF341A795801888" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Comprehensive Income (Loss), Net of Tax, Attributable to Parent</link:label>
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    <link:label id="lab_us-gaap_StatementOfCashFlowsAbstract_3F4DD240282B90606C6900EF84A9528B_label_en-US" xlink:label="lab_us-gaap_StatementOfCashFlowsAbstract_3F4DD240282B90606C6900EF84A9528B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Statement of Cash Flows [Abstract]</link:label>
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    <link:label id="lab_sif_GainLossonDispositionofAssetsOrImpairmentofAssets_9D4A4ED75E931501618100EF84ABE2BA_negatedTerseLabel_en-US" xlink:label="lab_sif_GainLossonDispositionofAssetsOrImpairmentofAssets_9D4A4ED75E931501618100EF84ABE2BA" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">(Gain) loss on disposal of operating assets or impairment of operating assets</link:label>
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    <link:label id="lab_us-gaap_InventoryLIFOReservePeriodCharge_CAB522315FD3830CEDC200EF84ABD4FB_terseLabel_en-US" xlink:label="lab_us-gaap_InventoryLIFOReservePeriodCharge_CAB522315FD3830CEDC200EF84ABD4FB" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">LIFO expense</link:label>
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    <link:label id="lab_sif_ShareTransactionsUnderCompanyStockPlan_4B0901FA755976E2F5EB00EF84ABE888_terseLabel_en-US" xlink:label="lab_sif_ShareTransactionsUnderCompanyStockPlan_4B0901FA755976E2F5EB00EF84ABE888" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share transactions under company stock plan</link:label>
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