GENERAL MOTORS ENGINEERING STANDARDS

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GENERAL MOTORS ENGINEERING STANDARDS


Thisspecificationcoverstheadhesion
requirementsofpressuresensitiveadhesivecoatedpartswhich
aresubjectedtolowornostressonthebondedsurfaceduring
shippingorafterassembly.Thesepartsareusuallymechani-
callyfastenedduringassemblyoperations.
1.1IfnoTypeisspecified,TypeIisassumed.

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substrateinitiallyandaftereachstepoutlinedinthetestcycles
in4.3.5.
4.3.3ImpactTest.Samplesaretobetestedafteradwelltime
of20minutes.Assembliesmustwithstandtwo0.8Jimpacts
initiallyandaftereachstepoftheappropriatecycle.Faceor
reverseimpactshallbedeterminedbytheapplication.
4.3.4EdgeAdhesionTest.Samplesaretobetestedaftera
dwelltimeof20minutes.Edgesofadherendmustbesecurely
bondeddifficulttoliftinitiallyandaftertheappropriatecycle.
4.3.5CyclesGM9505P.Onecycleshallberun,unlessother-
wisespecified.
CycleD..........Forinteriorapplicationsabovethebeltline
CycleE..........Forinteriorapplicationsbelowthebeltline
CycleC..........Forexteriorapplicationsabovethebeltline
CycleF.........Forexteriorapplicationsbelowthebeltline

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4.1RELEASELINER.Thereleaselinershalladheretothe
partsduringshipmentandstoragetoinsureprotectionofthe
adhesivecoating.Atthetimeofusage,thelinershallbe
readilyremovedwithouttearingordeformationofthepart.
4.2STORAGE.
4.2.1Theadhesivecoatedpartmustbeabletobebonded
afterstorageat40ÊCfor90days.
4.2.2Additionally,theadhesivecoatedpartmustwithstand
storageat60ÊCfor3days.
4.3ADHESION.Dependentuponthespecificapplication,
thedesignengineeristospecifywhichofthefollowing
requirementsareapplicable.
4.3.1CreepResistance.Oncebondedtotheappropriatesub-
strate,thepartmustremaininpositionwithoutshiftingfor7
daysat40ÊC.Asamplesetshallbeinspectedforcompliance
withthisrequirementaftereachofthefollowingconditions:
AInitial,bondedasreceived,standardconditions(25?
2ÊC,50%RH)
BBonded#16&Ecirc;C,<50%RH

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5.1Forapartbondedonlineandmechanicallyfasteneda
fewstationsdown,notrequiringimpactoredgeadhesion:
AdhesivePerformancetomeetGM3622M,TypeI.(Test
required:creep.)
5.2Forapartbondedonlineandmechanicallyfasteneda
fewstationsdown:
AdhesivePerformancetomeetGM3622M,TypeII.
(Testsrequired:creep,impact[initial],andedgeadhesion
[initial].)
5.3ForapartbondedataTier1supplierandmechanically
fastenedonline:
AdhesivePerformancetomeetGM3622M,TypeIII.
(Testsrequired:creep,peel[initial],impact[initial],and
edgeadhesion[initial].)
5.4ForapartbondedonlineorataTier1supplier,withno
additionalmechanicalfastening,andsubjectedtolowstress
duringservice:
AdhesivePerformancetomeetGM3622M,TypeIV.
(Testsrequired:creep,peel[initialandaftercycle],impact
[initialandaftercycle],andedgeadhesion[initialand
aftercycle].)
5.5ForapartbondedataTier1supplierandeitherstandard,
coolanddry,orhotandhumidconditions,andmechanically
fastenedonline:
AdhesivePerformancetomeetGM3622M,TypeIII,Plus
BondConditionsStandard,CoolandDry,andHotand
Humid.(Testsrequired:bondconditions4.3.1A,B,and
E;creep,peel[initial],impact[initial],andedgeadhesion