Technical Data Sheet LOCTITE 638 - …

1 TechnicalDataSheet LOCTITE 638 May-2004 PRODUCTDESCRIPTIONLOCTITE 638provides thefollowingproductcharacteristics:Techn ologyAcrylicChemicalTypeUrethanemethacry lateAppearance(uncured)GreenliquidLMSF luorescencePositive underUVlightLMSC omponentsOne component- requiresnomixingViscosityHighCureAnaerob icSecondaryCureActivatorApplicationRetai ningStrengthHighLOCTITE 638is designedforthebondingof cylindricalfittingparts, ( )andwheremaximumstrengthatroomtemperatur eisrequired. Theproductcureswhenconfinedintheabsenceo fairbetweenclosefittingmetalsurfacesandp reventslooseningandleakagefromshockandvi bration. @ 25 SeeMSDSV iscosity,Brookfield - RVT, 25 C,mPa s(cP):Spindle3, speed20rpm2,000 to3,000 LMSV iscosity, EN12092 -MV, 25 C,after180s, mPa s(cP).

2 Shearrate129s-11,500 to3, Thegraphbelowshowsthe shearstrengthdevelopedwithtimeonsteelpin sandcollarscomparedtodifferentmaterialsa ndtestedaccordingto of Full Strength on SteelCure Time10075502501min5min10min30min1h3h6h24 h72hSteelAluminumZinc of Full Strength on SteelCure Thegraphbelowshowsthe shearstrengthdevelopedwithtimeatdifferen ttemperaturesonsteelpinsandcollarsandtes tedaccordingto of Full Strength on SteelCure Time10075502501min5min10min30min1h3h6h24 h72h40 C22 C5 ,orlargegapsarepresent,applyingactivator tothesurfacewillimprovecurespeed. Thegraphbelowshowsshearstrengthdeveloped withtimeusingActivator 7471and7649onZincDichromatesteelpinsandc ollarsandtestedaccordingto of Full Strength on SteelCure Time10075502501min5min10min30min1h3h6h24 h72hNo ActivatorActivator 7471 Activator 7649 TYPICALPROPERTIESOFCUREDMATERIALP hysicalProperties:Coefficientof ThermalExpansion, ASTMD 696, K-180 10-6 Coefficientof ThermalConductivity,, W/(m K) ,kJ/(kg K) 638, May-2004 TYPICALPERFORMANCEOFCUREDMATERIALA dhesivePropertiesAfter 24 hours @22 CCompressiveShearStrength, ISO10123.

3 Steelpinsandcollars N/mm 25 LMS (psi) (3,625)After 15 minutes @22 CCompressiveShearStrength, ISO10123:Steelpinsandcollars N/mm (psi) (1,960)TYPICALENVIRONMENTAL RESISTANCEC uredfor 1 week @22 CCompressiveShearStrength, ISO10123:SteelpinsandcollarsHotStrengthT estedat temperature% RT StrengthTemperature, C1007550250050100150 HeatAgingAgedat temperatureindicatedandtested @22 C% Initial Strength at RTHours125100755025001000200030004000500 0120 C150 CChemical/SolventResistanceAgedundercond itionsindicatedandtested @22 C.

4 %ofinitialstrengthEnvironment C100hr500hr1000hrMotorOil125100100100 UnleadedPetrol221009085 Brakefluid221009080 WaterGlycol50/5087958080 Ethanol2210010075 Acetone22909090 GENERALINFORMATIONT hisproductisnotrecommendedforuseinpureox ygenand/oroxygenrichsystemsandshouldnotb eselectedasa ,consulttheMaterialSafetyDataSheet(MSDS) .Whereaqueouswashingsystemsareusedtoclea nthesurfacesbeforebonding,itisimportantt ocheckforcompatibilityofthewashingsoluti onwiththeadhesive. Insomecasestheseaqueouswashescanaffectth ecureandperformanceof notnormallyrecommendedforuseonplastics(p articularlythermoplasticmaterialswherest resscrackingoftheplasticcouldresult).

5 Usersarerecommendedtoconfirmcompatibilit yof ,cleanall surfaces(externalandinternal)witha Loctitecleaningsolvent andallowto thematerialis aninactivemetalorthecurespeedis toslow,spraywith Activator7471or7649 and allow , applyadhesivearoundtheleadingedgeofthepi nandthe insideofthecollarandusea , , theassemblyto approximately250 C. , 1995. Testreportsforeachbatchareavailableforth eindicatedproperties. LMStestreportsincludeselectedQCtestparam etersconsideredappropriatetospecificatio nsforcustomeruse. Additionally,comprehensivecontrolsareinp lacetoassureproductqualityandconsistency . + + + 638, May-2004 StorageStoreproductintheunopenedcontaine rina drylocation.

6 : 8 Cto21 C. Storagebelow8 Corgreaterthan28 Donotreturnproducttotheoriginalcontainer . additionalinformationis required, ( Cx )+ 32= FkV/mmx V/milmm/ inchesN x lbN/mmx lb/inN/mm x 145= psiMPax 145= psiN m x mm s= cPNoteThedatacontainedhereinarefurnished forinformationonlyandarebelievedtobereli able. Wecannotassumeresponsibilityfortheresult sobtainedbyothersoverwhosemethodswehaven ocontrol. It istheuser'sresponsibilitytodeterminesuit abilityfortheuser' ,HenkelCorporationspecificallydisclaimsa llwarrantiesexpressedorimplied,including warrantiesofmerchantabilityorfitnessfora particularpurpose,arisingfromsaleoruseof HenkelCorporation sproducts.

7 HenkelCorporationspecificallydisclaimsan yliabilityforconsequentialorincidentalda magesofanykind,includinglostprofits. Thediscussionhereinofvariousprocessesorc ompositionsisnottobeinterpretedasreprese ntationthattheyarefreefromdominationofpa tentsownedbyothersorasa licenseunderanyHenkelCorporationpatentst hatmaycoversuchprocessesorcompositions. Werecommendthateachprospectiveusertesthi sproposedapplicationbeforerepetitiveuse, usingthisdataasa guide. a trademarkof + + +