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<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedPeriodStartLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedPeriodStartLabel"/>
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  <link:roleRef roleURI="http://www.xbrl.org/2009/role/negatedTotalLabel" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedTotalLabel"/>
  <link:labelLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:label id="lab_sif_RedemptionOfPerpetualBond_label_en" xlink:label="lab_sif_RedemptionOfPerpetualBond" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Redemption of perpetual bond</link:label>
    <link:label id="lab_sif_RedemptionOfPerpetualBond_documentation_en" xlink:label="lab_sif_RedemptionOfPerpetualBond" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Total transactions with owners of the Company</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_RedemptionOfPerpetualBond" xlink:href="sif-2024-12-31.xsd#sif_RedemptionOfPerpetualBond"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_RedemptionOfPerpetualBond" xlink:to="lab_sif_RedemptionOfPerpetualBond" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_PaymentsForShareIssueCostsPreferenceShares_label_en" xlink:label="lab_sif_PaymentsForShareIssueCostsPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Payments for share issue costs, preference shares</link:label>
    <link:label id="lab_sif_PaymentsForShareIssueCostsPreferenceShares_documentation_en" xlink:label="lab_sif_PaymentsForShareIssueCostsPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Payments for share issue costs, preference shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_PaymentsForShareIssueCostsPreferenceShares" xlink:href="sif-2024-12-31.xsd#sif_PaymentsForShareIssueCostsPreferenceShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_PaymentsForShareIssueCostsPreferenceShares" xlink:to="lab_sif_PaymentsForShareIssueCostsPreferenceShares" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities_label_en" xlink:label="lab_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for decrease (increase) in contract assets and adjustments for increase (decrease) in contract liabilities</link:label>
    <link:label id="lab_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities_documentation_en" xlink:label="lab_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for decrease (increase) in contract assets and adjustments for increase (decrease) in contract liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:to="lab_sif_AdjustmentsForDecreaseIncreaseInContractAssetsAndAdjustmentsForIncreaseDecreaseInContractLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities_label_en" xlink:label="lab_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Initial direct costs on operating lease contracts paid, classified as operating activities</link:label>
    <link:label id="lab_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities_documentation_en" xlink:label="lab_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Initial direct costs on operating lease contracts paid, classified as operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities" xlink:href="sif-2024-12-31.xsd#sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities" xlink:to="lab_sif_InitialDirectCostsOnOperatingLeaseContractsPaidClassifiedAsOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_LogisticAndOtherProjectRelatedExpense_label_en" xlink:label="lab_sif_LogisticAndOtherProjectRelatedExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Logistic and other project related expense</link:label>
    <link:label id="lab_sif_LogisticAndOtherProjectRelatedExpense_documentation_en" xlink:label="lab_sif_LogisticAndOtherProjectRelatedExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Logistic and other project related expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_LogisticAndOtherProjectRelatedExpense" xlink:href="sif-2024-12-31.xsd#sif_LogisticAndOtherProjectRelatedExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_LogisticAndOtherProjectRelatedExpense" xlink:to="lab_sif_LogisticAndOtherProjectRelatedExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForFairValueGainsLossesOnShareAwards_label_en" xlink:label="lab_sif_AdjustmentsForFairValueGainsLossesOnShareAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for fair value gains (losses) on share awards</link:label>
    <link:label id="lab_sif_AdjustmentsForFairValueGainsLossesOnShareAwards_documentation_en" xlink:label="lab_sif_AdjustmentsForFairValueGainsLossesOnShareAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for fair value gains (losses) on share awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForFairValueGainsLossesOnShareAwards" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForFairValueGainsLossesOnShareAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForFairValueGainsLossesOnShareAwards" xlink:to="lab_sif_AdjustmentsForFairValueGainsLossesOnShareAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_FacilitiesHousingAndMaintenanceExpense_label_en" xlink:label="lab_sif_FacilitiesHousingAndMaintenanceExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Facilities, housing and maintenance expense</link:label>
    <link:label id="lab_sif_FacilitiesHousingAndMaintenanceExpense_documentation_en" xlink:label="lab_sif_FacilitiesHousingAndMaintenanceExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Facilities, housing and maintenance expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_FacilitiesHousingAndMaintenanceExpense" xlink:href="sif-2024-12-31.xsd#sif_FacilitiesHousingAndMaintenanceExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_FacilitiesHousingAndMaintenanceExpense" xlink:to="lab_sif_FacilitiesHousingAndMaintenanceExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_CurrentPrepaymentsAndOtherCurrentReceivables_label_en" xlink:label="lab_sif_CurrentPrepaymentsAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Current prepayments and other current receivables</link:label>
    <link:label id="lab_sif_CurrentPrepaymentsAndOtherCurrentReceivables_documentation_en" xlink:label="lab_sif_CurrentPrepaymentsAndOtherCurrentReceivables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Current prepayments and other current receivables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_CurrentPrepaymentsAndOtherCurrentReceivables" xlink:href="sif-2024-12-31.xsd#sif_CurrentPrepaymentsAndOtherCurrentReceivables"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_CurrentPrepaymentsAndOtherCurrentReceivables" xlink:to="lab_sif_CurrentPrepaymentsAndOtherCurrentReceivables" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_label_en" xlink:label="lab_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9</link:label>
    <link:label id="lab_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_documentation_en" xlink:label="lab_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for impairment loss (impairment gain and reversal of impairment loss) determined in accordance with IFRS 9</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:to="lab_sif_AdjustmentsForImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_IncreaseDecreaseInWorkingCapital_5658f216-7dde-47c7-b2a1-f35bbcbd7a7f_totalLabel_en" xlink:label="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Increase (decrease) in working capital</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:to="lab_ifrs-full_IncreaseDecreaseInWorkingCapital" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment_label_en" xlink:label="lab_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for depreciation and amortisation expense, intangible assets and property, plant and equipment</link:label>
    <link:label id="lab_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment_documentation_en" xlink:label="lab_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for depreciation and amortisation expense, intangible assets and property, plant and equipment</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment" xlink:to="lab_sif_AdjustmentsForDepreciationAndAmortisationExpenseIntangibleAssetsAndPropertyPlantAndEquipment" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_CurrentPayablesOnSocialSecurityAndWageTax_label_en" xlink:label="lab_sif_CurrentPayablesOnSocialSecurityAndWageTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Current payables on social security and wage tax</link:label>
    <link:label id="lab_sif_CurrentPayablesOnSocialSecurityAndWageTax_documentation_en" xlink:label="lab_sif_CurrentPayablesOnSocialSecurityAndWageTax" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Current payables on social security and wage tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_CurrentPayablesOnSocialSecurityAndWageTax" xlink:href="sif-2024-12-31.xsd#sif_CurrentPayablesOnSocialSecurityAndWageTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_CurrentPayablesOnSocialSecurityAndWageTax" xlink:to="lab_sif_CurrentPayablesOnSocialSecurityAndWageTax" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_PersonnelExpensesDirect_label_en" xlink:label="lab_sif_PersonnelExpensesDirect" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Personnel expenses, direct</link:label>
    <link:label id="lab_sif_PersonnelExpensesDirect_documentation_en" xlink:label="lab_sif_PersonnelExpensesDirect" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Personnel expenses, direct</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_PersonnelExpensesDirect" xlink:href="sif-2024-12-31.xsd#sif_PersonnelExpensesDirect"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_PersonnelExpensesDirect" xlink:to="lab_sif_PersonnelExpensesDirect" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_NonCurrentSaleAndLeasebackFinanceLiabilities_label_en" xlink:label="lab_sif_NonCurrentSaleAndLeasebackFinanceLiabilities" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Non-current sale and leaseback finance liabilities</link:label>
    <link:label id="lab_sif_NonCurrentSaleAndLeasebackFinanceLiabilities_documentation_en" xlink:label="lab_sif_NonCurrentSaleAndLeasebackFinanceLiabilities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Non-current sale and leaseback finance liabilities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_NonCurrentSaleAndLeasebackFinanceLiabilities" xlink:href="sif-2024-12-31.xsd#sif_NonCurrentSaleAndLeasebackFinanceLiabilities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_NonCurrentSaleAndLeasebackFinanceLiabilities" xlink:to="lab_sif_NonCurrentSaleAndLeasebackFinanceLiabilities" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_IssueOfPreferenceShares_label_en" xlink:label="lab_sif_IssueOfPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Issue of preference shares</link:label>
    <link:label id="lab_sif_IssueOfPreferenceShares_documentation_en" xlink:label="lab_sif_IssueOfPreferenceShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Issue of preference shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_IssueOfPreferenceShares" xlink:href="sif-2024-12-31.xsd#sif_IssueOfPreferenceShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_IssueOfPreferenceShares" xlink:to="lab_sif_IssueOfPreferenceShares" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities_7a789e53-c094-4d4e-a1c5-46d588727ada_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) operating activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards_label_en" xlink:label="lab_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase (decrease) through share-based payment transactions, fair value of share awards</link:label>
    <link:label id="lab_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards_documentation_en" xlink:label="lab_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase (decrease) through share-based payment transactions, fair value of share awards</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards" xlink:href="sif-2024-12-31.xsd#sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards" xlink:to="lab_sif_IncreaseDecreaseThroughShareBasedPaymentTransactionsFairValueOfShareAwards" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_PersonnelExpensesIndirect_label_en" xlink:label="lab_sif_PersonnelExpensesIndirect" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Personnel expenses, indirect</link:label>
    <link:label id="lab_sif_PersonnelExpensesIndirect_documentation_en" xlink:label="lab_sif_PersonnelExpensesIndirect" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Personnel expenses, indirect</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_PersonnelExpensesIndirect" xlink:href="sif-2024-12-31.xsd#sif_PersonnelExpensesIndirect"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_PersonnelExpensesIndirect" xlink:to="lab_sif_PersonnelExpensesIndirect" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_AdjustmentsForFinanceIncome_e0d7ec04-cc67-463d-829c-317ba4366ff4_negatedLabel_en" xlink:label="lab_ifrs-full_AdjustmentsForFinanceIncome" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en">Adjustments for finance income</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForFinanceIncome" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForFinanceIncome"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_AdjustmentsForFinanceIncome" xlink:to="lab_ifrs-full_AdjustmentsForFinanceIncome" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities_b555bd8b-f892-4a6f-a2e7-66b6384a6239_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) financing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:type="arc" order="1"/>
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    <link:label id="lab_sif_ProceedsFromGovernmentGrantsClassifiedAsOperatingActivities_documentation_en" xlink:label="lab_sif_ProceedsFromGovernmentGrantsClassifiedAsOperatingActivities" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Proceeds from government grants, classified as operating activities</link:label>
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    <link:label id="lab_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability_label_en" xlink:label="lab_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Non-current loans and borrowings - excl sale and leaseback liability</link:label>
    <link:label id="lab_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability_documentation_en" xlink:label="lab_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">LongtermBorrowings</link:label>
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    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability" xlink:to="lab_sif_NonCurrentLoansAndBorrowingsExclSaleAndLeasebackLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities_0c947886-7693-48ec-8f29-bad5fe54ee55_totalLabel_en" xlink:label="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Cash flows from (used in) investing activities</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:to="lab_ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_PaymentsForShareIssueCostsOrdinaryShares_label_en" xlink:label="lab_sif_PaymentsForShareIssueCostsOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Payments for share issue costs, ordinary shares</link:label>
    <link:label id="lab_sif_PaymentsForShareIssueCostsOrdinaryShares_documentation_en" xlink:label="lab_sif_PaymentsForShareIssueCostsOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Payments for share issue costs, ordinary shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_PaymentsForShareIssueCostsOrdinaryShares" xlink:href="sif-2024-12-31.xsd#sif_PaymentsForShareIssueCostsOrdinaryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_PaymentsForShareIssueCostsOrdinaryShares" xlink:to="lab_sif_PaymentsForShareIssueCostsOrdinaryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables_label_en" xlink:label="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for increase (decrease) in current value added tax payables</link:label>
    <link:label id="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables_documentation_en" xlink:label="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for increase (decrease) in current value added tax payables</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForIncreaseDecreaseInCurrentValueAddedTaxPayables"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents_60d0b61c-1ece-4028-aae3-c92c3d833e86_totalLabel_en" xlink:label="lab_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Increase (decrease) in cash and cash equivalents after effect of exchange rate changes</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalents" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalents"/>
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    <link:label id="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_7933736f-3ae5-44bb-8c52-f7f9f525669a_totalLabel_en" xlink:label="lab_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Increase (decrease) through transactions with owners, equity</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"/>
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    <link:label id="lab_sif_IssueOfOrdinaryShares_label_en" xlink:label="lab_sif_IssueOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Issue of ordinary shares</link:label>
    <link:label id="lab_sif_IssueOfOrdinaryShares_documentation_en" xlink:label="lab_sif_IssueOfOrdinaryShares" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Issue of ordinary shares</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_IssueOfOrdinaryShares" xlink:href="sif-2024-12-31.xsd#sif_IssueOfOrdinaryShares"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_IssueOfOrdinaryShares" xlink:to="lab_sif_IssueOfOrdinaryShares" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_ProductionAndGeneralManufacturingExpense_label_en" xlink:label="lab_sif_ProductionAndGeneralManufacturingExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Production and general manufacturing expense</link:label>
    <link:label id="lab_sif_ProductionAndGeneralManufacturingExpense_documentation_en" xlink:label="lab_sif_ProductionAndGeneralManufacturingExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Production and general manufacturing expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_ProductionAndGeneralManufacturingExpense" xlink:href="sif-2024-12-31.xsd#sif_ProductionAndGeneralManufacturingExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_ProductionAndGeneralManufacturingExpense" xlink:to="lab_sif_ProductionAndGeneralManufacturingExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_ProceedsFromSaleAndLeaseBackFacility_label_en" xlink:label="lab_sif_ProceedsFromSaleAndLeaseBackFacility" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Proceeds from sale and lease back facility</link:label>
    <link:label id="lab_sif_ProceedsFromSaleAndLeaseBackFacility_documentation_en" xlink:label="lab_sif_ProceedsFromSaleAndLeaseBackFacility" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Proceeds from sale and lease back facility</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_ProceedsFromSaleAndLeaseBackFacility" xlink:href="sif-2024-12-31.xsd#sif_ProceedsFromSaleAndLeaseBackFacility"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_ProceedsFromSaleAndLeaseBackFacility" xlink:to="lab_sif_ProceedsFromSaleAndLeaseBackFacility" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForDecreaseIncreaseInPrepayments_label_en" xlink:label="lab_sif_AdjustmentsForDecreaseIncreaseInPrepayments" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for decrease (increase) in prepayments</link:label>
    <link:label id="lab_sif_AdjustmentsForDecreaseIncreaseInPrepayments_documentation_en" xlink:label="lab_sif_AdjustmentsForDecreaseIncreaseInPrepayments" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for decrease (increase) in prepayments</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForDecreaseIncreaseInPrepayments" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForDecreaseIncreaseInPrepayments"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForDecreaseIncreaseInPrepayments" xlink:to="lab_sif_AdjustmentsForDecreaseIncreaseInPrepayments" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_FinanceCostsAndImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_8fd37d6e-69ee-4fe7-b752-a601bfe439d1_totalLabel_en" xlink:label="lab_sif_FinanceCostsAndImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en">Finance Costs And Impairment Loss Impairment Gain And Reversal Of Impairment Loss Determined In Accordance With IFRS 9</link:label>
    <link:label id="lab_sif_FinanceCostsAndImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9_label_en" xlink:label="lab_sif_FinanceCostsAndImpairmentLossImpairmentGainAndReversalOfImpairmentLossDeterminedInAccordanceWithIFRS9" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Finance Costs And Impairment Loss Impairment Gain And Reversal Of Impairment Loss Determined In Accordance With IFRS 9</link:label>
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    <link:label id="lab_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds_label_en" xlink:label="lab_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Increase (decrease) through conversion of advance factory payments to perpetual bonds</link:label>
    <link:label id="lab_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds_documentation_en" xlink:label="lab_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Increase (decrease) through conversion of advance factory payments to perpetual bonds</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds" xlink:href="sif-2024-12-31.xsd#sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds" xlink:to="lab_sif_IncreaseDecreaseThroughConversionOfAdvanceFactoryPaymentsToPerpetualBonds" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_SubcontractedWorkAndOtherExternalExpense_label_en" xlink:label="lab_sif_SubcontractedWorkAndOtherExternalExpense" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Subcontracted work and other external expense</link:label>
    <link:label id="lab_sif_SubcontractedWorkAndOtherExternalExpense_documentation_en" xlink:label="lab_sif_SubcontractedWorkAndOtherExternalExpense" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Subcontracted work and other external expense</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_SubcontractedWorkAndOtherExternalExpense" xlink:href="sif-2024-12-31.xsd#sif_SubcontractedWorkAndOtherExternalExpense"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_SubcontractedWorkAndOtherExternalExpense" xlink:to="lab_sif_SubcontractedWorkAndOtherExternalExpense" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax_label_en" xlink:label="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for increase (decrease) in current payables on social security and wage tax</link:label>
    <link:label id="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax_documentation_en" xlink:label="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for increase (decrease) in current payables on social security and wage tax</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax" xlink:to="lab_sif_AdjustmentsForIncreaseDecreaseInCurrentPayablesOnSocialSecurityAndWageTax" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability_label_en" xlink:label="lab_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Proceeds from new borrowings - excl sale and leaseback liability</link:label>
    <link:label id="lab_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability_documentation_en" xlink:label="lab_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Proceeds from new borrowing</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability" xlink:href="sif-2024-12-31.xsd#sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability"/>
    <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability" xlink:to="lab_sif_ProceedsFromNewBorrowingsExclSaleAndLeasebackLiability" xlink:type="arc" order="1"/>
    <link:label id="lab_sif_AdjustmentsForDepreciationRightOfUseAssets_label_en" xlink:label="lab_sif_AdjustmentsForDepreciationRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en">Adjustments for depreciation, right-of-use assets</link:label>
    <link:label id="lab_sif_AdjustmentsForDepreciationRightOfUseAssets_documentation_en" xlink:label="lab_sif_AdjustmentsForDepreciationRightOfUseAssets" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en">Adjustments for depreciation, right-of-use assets</link:label>
    <link:loc xlink:type="locator" xlink:label="loc_sif_AdjustmentsForDepreciationRightOfUseAssets" xlink:href="sif-2024-12-31.xsd#sif_AdjustmentsForDepreciationRightOfUseAssets"/>
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