7246-2 3M | Alldatasheet
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StructuralDAdhesiveDScotchmWeldD7246m2DB/ADFSTD 3M™DScotchmWeld™D7246m2DB/ADFSTD TwoDPartDStructuralDAdhesiveD ProductDDescriptionD 3M™ Scotch-Weld™ 7246-2 B/A FST is a two part structural flexible adhesive epoxy system. It is in conformance with flammability, smoke density and toxic gas emission (FST) requirements on standards FAR 25.853, JAR 25.853 and ABD0031. It is designed for aircraft interior bonding applications like corner splicing panel forming, insert bonding, thermoplastic bonding and bonding of tubular ducting. Room temperature cure from 20 – 25 °C is standard. Cure rate can be accelerated by application of mild heat. KeyDFeaturesD
- Two part paste adhesive meeting requirements of FAR/JAR 25.853 and ABD0031
- Excellent adhesion characteristics to aircraft interior substrates including thermoplastics
- Availability in duo-pack cartridges or in bulk for machine dispensing
- Flow control for vertical applications
- Halogen and heavy metal compound free FST system ProductDCharacterizationD The following technical information and data should be considered representative or typical only and should not be used for specification purposes. General properties Part B Part A ColourD OffmwhiteD LightDYellowD BaseD ModifiedDepoxyD ModifiedDamineD ConsistencyD ThixotropicDpaste,DlowDsagD ThixotropicDpaste,DlowDsagD BrookfieldDviscosityDSP7DmD20DRPMD 100DPasD 109DPasD SpecificDgravityD 1.61Dg/cm³D 1.27Dg/cm³D MixDratioDbyDvolumeDD(byDweight)D 100DD(100)D 100DD(79)D SpecificDgravityD(mix)D 1.44Dg/cm³DD(calculated)D WorkDlifeDatD23D±D2D°CD >D90DminutesDforD20DgDmixDatD23D±D2D°CD TypicalDtimeDtoDhandlingDstrengthD(a)D AroundD5DhoursDatD23D±D2D°CD CureDcycleD 7DdaysDatD23D±D2°CDorD12DtoD24DhoursDatDRTDfollowedDbyD60DminDatD80D±D5D°C.D ForDfurtherDdetailsDseeD“InstructionsDforDuse”DonDpageD4. ServiceDtemperatureDrangeD m55D°CDtoD80D°CD ShelfDlifeD 12DmonthsDfromDdateDofDshipmentDatD20D±D5D°CD (a)DTimeDtoDreachD1DMPaDoverlapDshearDstrengthD DD TechnicalDDataDSheetD Aerospace D
StructuralDAdhesiveDScotchmWeldD7246m2DB/ADFSTDPageD2DofD4D ProductDPerformanceD The following product performance data were obtained using two different cure cycles: Cure cycle 1: 12 to 24 h at 23 ± 2 °C; cure pressure 100 kPa during first 6 hours, followed by 60 to70 min at 80 ± 5 °C Cure cycle 2: 7 days at 23 ± 2 °C; cure pressure 100 kPa during first 24 hours. Mechanical properties Test temperature Cure cycle 1 Cure cycle 2 Test method Overlap shear strength D mD55D°CD D 24DMPaD D 23.7DMPaD END2243m1D D 23D°CD D 14DMPaD D 17.1DMPaD END2243m1DAlD2024DT3Dclad,Doptimized.DFPLD(a)D(b)D D 80D°CD D 3.4DMPaD D 3.3DMPaD END2243m1D Overlap shear strength D mD55D°CD mD D 7.5DMPaD (d)D END2243m1D D 23D°CD mD D 7.2DMPaD END2243m1DPPSUD99490,D1.5DmmDthickD(c)D D 80D°CD mD D 2.6DMPaD END2243m1D Overlap shear strength D mD55D°CD mD D 9.5DMPaD (d)D END2243m1D D 23D°CD mD D 8.1DMPaD END2243m1DPEI,D1.35DmmDthickD(c)D D 80D°CD mD D 2.7DMPaD END2243m1D Floating roller peel strength AlD2024DT3Dclad,Doptimized.DFPLD(a) D 23D°CD D 148DND/D25DmmD D 202DND/D25mmD END2243m2D (a)DSeeD“InstructionsDforDuse”DonDpageD4D(b)D3Dwt.%DofDglassDmicrospheresD(200D–D300Dµm)DwereDaddedDtoDcontrolDtheDbondDlineDthickness.D (c)DSurfaceDpreparation:DdegreaseDwithDisopropylDalcohol,DlightDabrasionDusingDScotchmBrite™D7447,DdegreaseDwithDisopropylDalcohol.D (d)DSubstrateDfailureD AgeingDpropertiesD Overlap shear was measured after immersion in different media to determine the environmental resistance of 3M™ Scotch-Weld™ 7246-2 B/A FST. The following cure cycles were used: Cure cycle 1: 7 days at 23 ± 2 °C; cure pressure 100 kPa during first 24 hours Cure cycle 2: 24 h at 23 ± 2 °C; cure pressure 100 kPa during first 24 hours, followed by 60 min post-cure at 80 °C. Mechanical Properties Medium and temperature Cure cycle 1 Cure cycle 2 Overlap shear strength after ageing DemineralisedDwaterDatD23D±D2D°CD D 8.7DMPaD D 8.4DMPaD 5D%DNaClDsaltDsprayDatD35D°CD D 6.8DMPaD D 6.9DMPaD HydraulicDfluidDSkydrolD500BDatD23D°CDD 14.8DMPaD D 15.8DMPaD 85D%DrelativeDhumidityDatD70D°CD D 12.1DMPaD D 12.2DMPaD LubrificatingDoilDNATODOm160DatD23D°CDD 14.4DMPaD D 15.4DMPaD JetDfuelDNATODFm35DatD23D°CD D 16.4DMPaD D 17.3DMPaD TheDstandardDsamplesDwereDexposedDtoDtheD environmentsDforD1000Dhours.D AlD2024DT3Dclad,Doptimized.DFPLD (a)D(b).D OverlapDshearDaccordingDtoDEND2243m1DwasD measuredDatD23D±D2D°C.D D TributylDphosphateDatD23D°CD D 15.0DMPaD D 15.4DMPaD (a)DAllDcladD2024DT3DsubstratesDwereDetchedDwithDsulfochromicDacid.D (b)D3Dwt.%DofDglassDmicrospheresD(200D–D300Dµm)DwereDaddedDtoDcontrolDtheDbondDlineDthickness.D MechanicalDStrengthD–DInsertDBondingD The mechanical resistance of insert bonding has been evaluated for the shear mode. Data below have been established using a cure cycle of 7 days at 23 ± 2 °C. Mechanical Properties Test temperature Result InsertDpullDoutDperformanceD(a)D(b)D 23D±D2D°CD D 875DND InsertDshearDperformanceD(a)D(b)D 23D±D2D°CD D 1700DND (a)DNASD1836mC08m08DinsertsD D D (b)D10DmmDthickDsandwichDpanelsDusingDsingleDlayerDglassDphenolicDfabricD(43D%Dresin)DandD Nomex™DhexagonalDcoreDofD4.8DmmDcellDsizeDandDaDdensityDofD0.032Dg/cm³D
StructuralDAdhesiveDScotchmWeldD7246m2DB/ADFSTD PageD3DofD4D StrengthDbuildmupD Typical overlap shear strength build-up at 23 ± 2 °C. For substrates and surface preparation see tables on page 2. Handling strength at RT of Scotch-Weld 7246-2 B/A FST 0 3H30 4H00 4H30 5H00 5H30 6H00 6H30 7H00 7H30 8H00 8H30 9H00 9H 30 10H00 10H30 11H00 MPa Flammability,DSmokeDDensityDandDToxicDGasDEmissionD Flammability properties Requirements Results Flammability DD(60DsDvertical,DstandDaloneD)D FlameDextinguishingDtimeD D ≤D15DsD D 0DsD BurnDlengthDtimeD D ≤D152DmmD D 124DmmDFAR/JAR/CSD25.853(a),DApp.DFDpartDI(a)(1)(i)D SampleDsize:D0.5DxD325DxD75Dmm³D DripDflameDtimeD D ≤D3DsD D 0DsD Flammability DD(60DsDvertical,DadhesiveDonDaluminium)D FlameDextinguishingDtimeD D ≤D15DsD D 0DsD BurnDlengthDtimeD D ≤D152DmmD D 10.2DmmDFAR/JAR/CSD25.853(a),DApp.DFDpartDI(a)(1)(i)D SampleDsize:D 3.2DxD325DxD75Dmm³D(aluminium)D D 0.8DxD325DxD75Dmm³D(adhesive)D DripDflameDtimeD D ≤D3DsD D 0DsD Smoke emission DD(flamingDmode)D FAR/JAR/CSD25.853(d)DApp.DFDpartDV(b)D SampleDsize:D 2.5DxD75DxD75Dmm³D DS max (a)DinD4DminD D ≤D200D D 50D Toxic gas emission DD(flamingDmode)D COD D ≤D1000DppmD D 250DppmD HCND D ≤DD150DppmD D 28DppmD HFD D ≤D100DppmD D 23DppmD HClD D ≤D150DppmD D 3DppmD SO 2D D ≤D100DppmD D <D10DppmD AirbusDABD0031D BoeingDD6m51377D SampleDsize:D 2.5DxD75DxD75Dmm³D NO xD D ≤D100DppmD D 55DppmD (a)DDS max :DmaximumDopticalDsmokeDdensityD Handling,DApplication,DStorageD PrecautionaryDInformationD Refer to product label and Material Safety Data Sheet (MSDS) for health and safety information before using this product. For MSDS visit our website www.3M.com/msds . D
StructuralDAdhesiveDScotchmWeldD7246m2DB/ADFSTDPageD4DofD4D InstructionsDforDuseD Process step Instruction SurfaceDpreparationD ADthoroughlyDcleaned,Ddry,DgreasemfreeDsurfaceDisDessentialDforDmaximumDperformance.DCleaningDmethods,D whichDwillDproduceDaDcontinuousDwaterDfilmDonDaDmetalDsurfaceDareDgenerallyDsatisfactory.DHowever,DtheD necessaryDamountDofDsurfaceDpreparationDdependsDonDtheDuser’sDrequiredDbondDstrengthDandDenvironmentalD ageingDresistance.DTheDresultsDgivenDinDthisDdataDsheetDwereDdeterminedDusingDanDoptimizedDFPLDetchingD process:D 1)DDegreaseDwithDmethylDethylDketone.D 2)DImmerseD10DtoD20DminutesDinDalkalineDdegreasingD8D%DOakiteD164DsolutionDatD85D±D5D°C.D 3)DRinseDinDtapDwater.D 4)DSulfochromicDimmersionD(10Dminutes)DatD70D±D2D°C:D27.5Dwt.%DofDH 2SO 4;D7.5Dwt.%DofDNa 2Cr2O7DD2DH 2O;D DDDD65Dwt.%DofDdemineralisedDwater;D0.5Dg/lDaluminium;D1.5Dg/lDCuSO 4DD5DH 2O.D 5)DRinseDinDtapDwater.D 6)DDryD15DminutesDatD23D±D2D°C.D 7)DDryD10DminutesDatD70D±D2D°C.D Caution: Use adequate respiratory, eye and skin protection when using etch solutions. DD ApplicationD ThisDproductDconsistsDofDtwoDparts.DMixDpartDBDandDpartDADthoroughlyDmanuallyDorDautomaticallyDbyDweightDorD volumeDinDtheDproportionsDspecifiedDonDtheDproduct.DMixDmanuallyDapproximatelyD15DsecondsDafterDaDuniformD colourDisDobtained.DCaution: DTheDworkDlifeDdiffersDaccordingDtoDpotDsizeDandDtemperature.DLargerDquantitiesD andDhigherDtemperaturesDcreateDfasterDreactionDtimes.DHeatDisDgeneratedDduringDcure.DForDmaximumDbondD strengthDapplyDtheDproductDevenlyDtoDbothDsurfacesDtoDbeDjoined.DOptimumDprocessingDtemperaturesDforD adhesiveDandDsubstrateDareDbetweenD20D–D25D°C.DTheDadhesiveDcanDbeDappliedDmanually,De.Dg.DbyDaDspatula,D orDsemimDtoDfullDautomatic.DMaximumDstrengthDisDobtainedDwithD0.10D–D0.25DmmDbondDlineDthickness.DForD repeatableDperformanceDkeepDtheDmixDratioDinDaDrangeDofD±D5D%.D ScotchmWeld™D7246m2DB/ADFSTDisDsuppliedDinD200DmlDduompackDcartridges.DCartridgeDmaterialDshouldDbeDusedD inDcombinationDwithD3MDmanualDdispenserDref.D08117DorDwithD3MDpneumaticDdispenserD09930.DForDhighDqualityD mixingDresultsDitDisDalsoDrecommendedDtoDuseDstaticDmixingDnozzlesDref.D08193.DSpatulaDand/orDtrowelDmayD alsoDbeDusedDforDapplicationsDonDlargerDsurfaces.D CuringD LargerDquantitiesDand/orDhigherDtemperaturesDwillDreduceDtheDworkDlife.DJoinDtheDsurfacesDcoatedDwithDadhem siveDandDcureDtheDmaterialDaccordingDtoDmentionedDcureDcycles.DAvoidDmovingDofDpartsDuntilDhandlingDstrengthD isDreached.DContactDpressureDisDnecessary.DTheDfollowingDtimesDandDtemperaturesDwillDresultDinDaDfullDcure:D /square4 7DdaysDatD23D±D2D°C;DcureDpressureD100DkPaDduringDtheDfirstD24DhoursD /square4 12DtoD24DhDatD23D±D2D°C;DcureDpressureD100DkPaDduringDtheD6DfirstDhours,DfollowedDbyD60DtoD70DminDatD80D±D5D°C.D CleaningD ExcessDuncuredDadhesiveDcanDbeDcleanedDwithDketoneDtypeDsolvents.DAfterDcureDtheDadhesiveDcanDbeD removedDmechanically.DNote: DWhenDusingDsolvents,DextinguishDallDignitionDsources,DincludingDpilotDlights,DandD followDtheDmanufacturer’sDprecautionsDandDinstructionsDforDuse.D StorageD StoreDtheDproductDatDroomDtemperatureDorDbelow.DShelfDlifeDatD15D–D25D°CDisD12DmonthsDfromDdateDofDshipmentD inDtheDoriginalDunopenedDcontainersDorDusedDcartridges.D Important notice: AllDstatements,DtechnicalDinformationDandDrecommendationsDinDthisDdataDsheetDareDbasedDonDtestsD3MDbelievesDtoDbeDreliable,DbutDtheDaccuracyDorD completenessDofDthoseDtestsDisDnotDguaranteed.DAllDtechnicalDdataDandDinformationDshouldDbeDconsideredDtypicalDorDrepresentativeDonlyDandDshouldDnotDbeDusedDforD specificationDpurposes.DGivenDtheDvarietyDofDfactorsDthatDaffectDtheDuseDandDperformanceDofDaD3MDproduct,DsomeDofDwhichDareDuniquelyDwithinDtheDuser’sDknowledgeDandD control,DitDisDessentialDthatDtheDuserDevaluateDtheD3MDproductDbeforeDuseDtoDdetermineDtheDsuitabilityDofDtheD3MDproductDforDtheDintendedDuseDandDmethodDofDapplication.DAllD questionsDofDliabilityDrelatingDtoDtheD3MDproductDareDgovernedDbyDtheDtermsDofDtheDsaleDsubjectDto,DwhereDapplicable,DtheDprevailingDlaw.D D Aerospace and Aircraft Maintenance Department European Aerospace Laboratory www.3m.eu/aerospaceD D ©D3MD2010.DAllDrightsDreserved .D Reference:D114D