GM 7400M塑料规范标准

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1、MaterialSpecificationGM7400MPlasticsPlasticParts1ScopeSuffixCharacteristicsSymbolThisstandardprovidesasystemforspecifyingsignif-FLFlexuralModulus–Secanticantpropertiesofcommonlyusedplastics,includingunpigmentedandpigmented,unfilledandfilledprod-FLSFlexuralModulus–Secant–ISOuc

2、ts.Itisintendedtoapplytoparts(notresins)pri-FMFlexuralModulus–Tangentmarilyasusedintheautomotiveandrelatedindus-tries.ItisalsointendedtobeusedeitherasthesoleFSFlexuralStrengthdescriptorofamaterialorwithinthebodyofaspecifi-FSSFlexuralStrength–ISOcationcoveringthecommonstandard

3、characteristicsrequiredwhereinadditionalspecializedrequirementsHAHardness–ShoreAaredetailed.HASHardness–ShoreA–ISO1.1MaterialDescription.ItisbasedontheprincipleHDHardness–ShoreDthatplasticsshouldbedescribed,insofarasispossi-ble,intermsofspecificperformancecharacteristicsHDSHa

4、rdness–ShoreD–ISOdesiredinthemoldedpartandthataninfinitenumberHEHardness–RockwellEofsuchdescriptionscanbeformulatedbytheuseofoneormorestandardstatements(basedonstandardHKHardness–RockwellKtests)eachdesignatingaqualitylevelofapropertyorHLHardness–RockwellLcharacteristic.Thus,u

5、sersofplasticpartscan,byse-lectingdifferentcombinationsofperformancecharac-HMHardness–RockwellMteristics,specifydifferentcombinationsofpropertiesHRHardness–RockwellRdesiredinvariousparts.MPMeltingPointTable1:PropertiesMPSMeltingPoint–ISOSuffixCharacteristicsSymbolMVVicatSofte

6、ningPointAHHeatAgingMVSVicatSofteningPoint–ISOAHSHeatAging–ISOPLPartingLines(GM9684P)AMHumidityAgingPRImpactResistance(GM9032P)AMSHumidityAging–ISOPSMulti-AxialInstrumentedImpactBTBrittlenessTemperaturePTImpactResistance(GM9300P)CLColorRERegrindCRChemicalResistanceRFReinforce

7、mentand/orFillerCSCompressiveStrengthSGSpecificGravityCSSCompressiveStrength–ISOTCThermalCycleResistanceDSDimensionalStabilityTRTensileStrength–RubberELElongationTRSTensileStrength–Rubber–ISOELSElongation–ISOTSTensileStrength©CopyrightJune2001GeneralMotorsCorporationAllRights

8、ReservedOriginatingDepartment:NorthAmericanEngineeringStandards,Reco