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    <link:label id="lab_ftk_SharebasedGoodsandNonemployeeServicesTransactionGrantsinPeriod_6C5D36F3882B92944185D950A973817C_terseLabel_en-US" xlink:label="lab_ftk_SharebasedGoodsandNonemployeeServicesTransactionGrantsinPeriod_6C5D36F3882B92944185D950A973817C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted in service provider (in shares)</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5723A0CCA603A83A9BBCD950A9740A14_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_5723A0CCA603A83A9BBCD950A9740A14" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Forfeited (in dollars per share)</link:label>
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    <link:label id="lab_ftk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPriorYearShareEquivalentsNotEarnedWeightedAverageGrantDateFairValue_AB289C8DF69EA16BE5B2D950A974E287_terseLabel_en-US" xlink:label="lab_ftk_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPriorYearShareEquivalentsNotEarnedWeightedAverageGrantDateFairValue_AB289C8DF69EA16BE5B2D950A974E287" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Share equivalents not earned (in dollars per share)</link:label>
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    <link:label id="lab_ftk_SharebasedGoodsandNonemployeeServicesTransactionWeightedAverageGrantDateFairValue_7CBDFA36F68A9E4856C1D950A974FD01_terseLabel_en-US" xlink:label="lab_ftk_SharebasedGoodsandNonemployeeServicesTransactionWeightedAverageGrantDateFairValue_7CBDFA36F68A9E4856C1D950A974FD01" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Granted to service provider (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9312C60301395B37E232D950A974D92D_periodEndLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_9312C60301395B37E232D950A974D92D" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel" xlink:type="resource" xml:lang="en-US">Non-vested at end of period (in dollars per share)</link:label>
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    <link:label id="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6D755375B7F699A7742CD7A2A3746C04_terseLabel_en-US" xlink:label="lab_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_6D755375B7F699A7742CD7A2A3746C04" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">2020</link:label>
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    <link:label id="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D13DAD30CDC09F49F4CBB5028D4B6ACD_verboseLabel_en-US" xlink:label="lab_us-gaap_CashAndCashEquivalentsAtCarryingValue_D13DAD30CDC09F49F4CBB5028D4B6ACD" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash and cash equivalents</link:label>
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    <link:label id="lab_us-gaap_GoodwillGross_E78B3CCA5FBF0641DD11A0BDE32E5943_label_en-US" xlink:label="lab_us-gaap_GoodwillGross_E78B3CCA5FBF0641DD11A0BDE32E5943" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Goodwill, Gross</link:label>
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    <link:loc xlink:href="ftk-20171231.xsd#ftk_DebtCovenantPeriodAxis" xlink:label="loc_ftk_DebtCovenantPeriodAxis_9C286F43D8805ADB84B491521F0C4FD7" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_53E943CA5683FA4BB878A0BDE384878D_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_53E943CA5683FA4BB878A0BDE384878D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities, Continuing Operations</link:label>
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    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_53E943CA5683FA4BB878A0BDE384878D" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations_53E943CA5683FA4BB878A0BDE384878D" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_11FEBAEC0F509E896CFFA0BDE384A7BA" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Capital expenditures</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB" xlink:to="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_7B4A7F2506D42F249AFBA0BDE38557FB" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of businesses</link:label>
    <link:label id="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4_label_en-US" xlink:label="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Divestiture of Businesses</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4" xlink:to="lab_us-gaap_ProceedsFromDivestitureOfBusinesses_DD749C74FACE15E1212AA0BDE385E3B4" xlink:type="arc" />
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE_verboseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from sale of assets</link:label>
    <link:label id="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE_label_en-US" xlink:label="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Sale of Property, Plant, and Equipment</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE" xlink:to="lab_us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment_CFBC8F96EE392B665F2CA0BDE385B5DE" xlink:type="arc" />
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_167104338F3CF7A3EC31A0BDE385666C_negatedTerseLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_167104338F3CF7A3EC31A0BDE385666C" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel" xlink:type="resource" xml:lang="en-US">Payments for acquisitions, net of cash acquired</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_167104338F3CF7A3EC31A0BDE385666C_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_167104338F3CF7A3EC31A0BDE385666C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Businesses, Net of Cash Acquired</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_167104338F3CF7A3EC31A0BDE385666C" xlink:type="locator" />
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    <link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchase of patents and other intangible assets</link:label>
    <link:label id="lab_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651_label_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Payments to Acquire Intangible Assets</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireIntangibleAssets" xlink:label="loc_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651" xlink:to="lab_us-gaap_PaymentsToAcquireIntangibleAssets_D8F796D863A297710C7DA0BDE385A651" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities, Continuing Operations</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43" xlink:to="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations_0A67671355D8C06DDA4BA0BDE3855D43" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC_verboseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC" xlink:to="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_B505DA3FCD379E228BCCA0BDE385D9EC" xlink:type="arc" />
    <link:label id="lab_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_E9C0EEE61D8DAAAFEEA1A0BDE385FB93_negatedLabel_en-US" xlink:label="lab_us-gaap_RepaymentsOfDebtAndCapitalLeaseObligations_E9C0EEE61D8DAAAFEEA1A0BDE385FB93" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Repayments of indebtedness</link:label>
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    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7972C07296A80E1A72CDA0BDE385615A_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7972C07296A80E1A72CDA0BDE385615A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Borrowings on revolving credit facility</link:label>
    <link:label id="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7972C07296A80E1A72CDA0BDE385615A_label_en-US" xlink:label="lab_us-gaap_ProceedsFromLongTermLinesOfCredit_7972C07296A80E1A72CDA0BDE385615A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Proceeds from Long-term Lines of Credit</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromLongTermLinesOfCredit" xlink:label="loc_us-gaap_ProceedsFromLongTermLinesOfCredit_7972C07296A80E1A72CDA0BDE385615A" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RepaymentsOfLongTermLinesOfCredit" xlink:label="loc_us-gaap_RepaymentsOfLongTermLinesOfCredit_9D3CD395A87053F36B3DA0BDE3856631" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ConcentrationRiskPercentage1_8F18FBD41C70646E4B402CED864FF440_label_en-US" xlink:label="lab_us-gaap_ConcentrationRiskPercentage1_8F18FBD41C70646E4B402CED864FF440" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Concentration Risk, Percentage</link:label>
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    <link:label id="lab_us-gaap_CostsAndExpensesAbstract_2E39688858B008030378A0BDE394B239_label_en-US" xlink:label="lab_us-gaap_CostsAndExpensesAbstract_2E39688858B008030378A0BDE394B239" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Costs and Expenses [Abstract]</link:label>
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    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_3227E05202BADB1A5C2AA0BDE394EFF0_verboseLabel_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_3227E05202BADB1A5C2AA0BDE394EFF0" xlink:role="http://www.xbrl.org/2003/role/verboseLabel" xlink:type="resource" xml:lang="en-US">Other (expense) income:</link:label>
    <link:label id="lab_us-gaap_NonoperatingIncomeExpenseAbstract_3227E05202BADB1A5C2AA0BDE394EFF0_label_en-US" xlink:label="lab_us-gaap_NonoperatingIncomeExpenseAbstract_3227E05202BADB1A5C2AA0BDE394EFF0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Nonoperating Income (Expense) [Abstract]</link:label>
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    <link:label id="lab_us-gaap_InterestExpense_75BB4FDB6A3FADD692E7A0BDE3945DE8_label_en-US" xlink:label="lab_us-gaap_InterestExpense_75BB4FDB6A3FADD692E7A0BDE3945DE8" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Interest Expense</link:label>
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