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1、-GENERALMOTORSENGINEERINGSTANDARDSMaterialsandProcesses-PlasticsPERFORMANCEREQUIREMENTSFOREXTERIORPLASTICPARTSGM7452M1SCOPE.Thisspecificationcoverstheperformancere-3.2.3Thistestisnotapplicabletopartswhenthewordsquirementsofunpaintedorclearcoatedplasticpartsusedin“exceptxenon”areappended
2、tothespecificationnumberonexteriorautomotiveapplications.Thepartsmaybefunctionalthepartdrawing.withinthemselvesortheymaybeasubassemblyof,orattachedto,metallic,decorativeorfunctionalparts.3.3Humidity.Partsshallnotshowanysurfacedeteriora-tion,objectionableshrinkage,ornoticeablecolororglos
3、s1.1Clearcoatedpartsmustmeettherequirementsofchangeafter7daysexposureperGM4465P.EvaluationofGM435OM.ClassAO,inadditiontomeetingtherequire-thepartsshallbemadeafter24hambientexposure.mentsofthisspecification.3.4OvenAging.Partsshallnotshowanysurfacedeteriora-1.2Requirementsforpartspaintedb
4、odycolorshouldbetion,objectionableshrinkage,ornoticeablecolororglossspecifiedperGlU435OM.ClassAO,notbythisspecillcation.changeafter7daysexposureat80f2°Cinanair-circulatingoven.1.3Partswhichrequiregasolineresistancewillbedesignat-edbythesulkG.3.5DimensionalStabilityTest.onlyapplicabletop
5、artswhichincorporatemorethanonetypeofmaterialintheirExampleoffuellillerdoor:GM7452M-Gconstruction.Partashallnotshowanycrazing,discoloration,cloudiness,blistering,objectionableshrinkage,deformation,orlossofadhesiontothesubsrateorbetweenlayersofthe2REFERENCEDSTANDARDS.compositeatanypointw
6、ithinthefollowingcyclicsequenceorafteritscompletion:GM435OMGM9508PGM4465PGM9900P3hminat-30+2”CGM4476PSAEJ154515minutesmmat25f5Y!GM9125PSAEJ19603hminat82f1.5”CGM95OlP15minuteaminat25+5OC17hhumidityminperGM4465P3REQUIREMENTS.Unlessotherwisespecikl,partashallmeetthefollowingrequirementsand
7、shallbetestedEvaluatefordetrimentaleffecta.mlderstandarduxlditions,22a3°Cand50*5%RI-I:3.6GasolineResistance(G-&Rxonly),GM95OlP.Im-3.1RawMaterialSpecificationConformance.Thewmpo-mersethepartfor10sinafuelconsistingof45%byvolumenentsoftheassemblymustmeettheindividualmaterialtoluen
