GMN3943-2003ScratchandMarResistanceofPlastics.pdf

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1、ENGINEERINGTestMethodGMN3943STANDARDSMaterialsScratchandMarResistanceofPlastics,FiveArmTestSmoothSurfaces1ScopeArm#TipLoad(N)Thistestmethoddescribesatestingdeviceand118.0procedureforevaluationofthescratchandmarresistanceofplastics.Fivemetaltips,variably213.0loaded,res

2、tnormaltothesurfaceofaMolded-In-38.0Colorplastictestplaqueandaredraggedacrossthedesiredtestarea.43.0Note:Nothinginthistestmethodsupersedesap-50.6plicablelawsandregulationsunlessaspecificexemptionhasbeenobtained.GrainedSurfacesNote:IntheeventofaconflictbetweentheEnglis

3、handdomesticlanguage,theEnglishlanguageshallArm#TipLoad(N)takeprecedence.120.02References215.0Note:Onlythelatestapprovedstandardsareap-310.0plicableunlessotherwisespecified.45.02.1ExternalStandards/Specifications.53.0SAEJ1545Non-standardforcesmaybeemployedatthedisc-2.

4、2GMStandards/Specifications.retionoftheappropriatematerialstandardortestengineer.WeightcanbeloadedontothearminNone.threedifferentpositionsasdesiredasshownbelowinFigure1anddescribedinTable1:3TestEquipmentThebasictestingdevicehasabaseandfivemo-vablearmswithmetaltips.One

5、endofeacharmisfixedandtheotherendisfittedwithinterchan-geablescratchormarsteeltips,highlypolished,hardenedtoRC48-52.Thetipsare7.0±0.2mmdiameterhemisphereformarand1.0±0.1mmdiameterhemisphereforscratch.Thetipsareloadedwithdifferentweightsexertingthefollowingstandardforc

6、esonasmoothorgrainedsurface:Figure1:WeightPlacementonArm©CopyrightJune2003GeneralMotorsCorporationAllRightsReservedJune2003OriginatingDepartment:NorthAmericanEngineeringStandardsPage1of3GMN3943GMENGINEERINGSTANDARDSTable1:Force/MassChartplaquesorregionscutfromplasticp

7、artswhicharesufficientlyflattoprovideforaccurateassessment.Force(N)MassIDPositionof5.3TestProcedure.NeededMassonArm5.3.1Sampleshallbepre-coditionedinacontrolled0.6N00atmosphereof23±3°Cand50±6%relativehu-midityfornotlessthan24hpriortotestingand2NA1shallbetestedunderthe

8、sameconditionsunless3NB2otherwisespecified.4.5NC35.3.2Installthespecifiedscratchtips(either1.0or7.0mmdiameterasspecifiedbyth