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【英文标准名称】:StandardTestMethodforMeasuringtheDynamicMechanicalPropertiesofPlasticsUsingThreePointBending
【原文标准名称】:用三点弯曲法测量塑料动态力学性能的标准试验方法
【标准号】:ASTMD5023-1999
【标准状态】:作废
【国别】:美国
【发布日期】:1999
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:ASTM
【标准类型】:()
【标准水平】:()
【中文主题词】:热固性聚合物;弯曲试验;试验;塑料;流动性
【英文主题词】:plastics;thermosettingpolymers;testing;bendtesting;abilitiestoflow
【摘要】:
【中国标准分类号】:G31
【国际标准分类号】:83_080_01
【页数】:4P;A4
【正文语种】:英语


【英文标准名称】:StandardTestMethodsforRelativePermittivity(DielectricConstant)andDissipationFactorbyFluidDisplacementProcedures
【原文标准名称】:用液体位移法测定相对介电常数和耗散因数的标准试验方法
【标准号】:ASTMD1531-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D09.12
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:聚乙烯;测试
【英文主题词】:dielectricconstant;dissipationfactor;fluiddisplacement(singlefluid);fluiddisplacement(twofluid);immersionmethod;permittivity
【摘要】:Permittivity:5.1.1PolyethyleneandMaterialsofPermittivityWithin0.1ofThatofPolyethylene8212;Sincethepermittivityofbenzeneor1-cStsiliconefluidisveryclosetothatofpolyethylene,thesefluidsarerecommendedforhighlyaccurateandprecisetestingofpolyethyleneorothermaterialswithpermittivityclosetothatofpolyethylene.Theseaspectsofthetestmethodmakeitasuitabletooltodeterminebatch-to-batchuniformityofapolyethylenecompoundtomeetpreciserequirementsofhighcapacitanceuniformityandcapacitancestabilityinelectronicapparatus.Italsoservesasameanstodetectimpurities,aswellaschangesresultingfromprolongedexposuretohighhumidity,waterimmersion,weathering,aging,processingtreatments,andexposuretoradiation.5.1.2OtherMaterials8212;Thistestmethodprovidesadvantagesforroutinetestingofthosematerialsthathaveapoorermatchinpermittivitybetweentheliquidsmentionedin5.1.1andthespecimen.Theseadvantagesinclude,butarenotlimitedto,areductionoftheprobabilityoferrorscausedbyimprecisethicknessdataandtheeasewithwhichtestscanbeperformed.Correctionfactorscanbecalculatedtoaccountforthebiasintroducedbythepermittivitymismatch.Thetwoliquidsmentionedin5.1.1arenottheonlyliquidshavingknownvaluesofdielectricpropertiesandareknowntobecompatiblewithasolidelectricalinsulatingmaterial.DissipationFactor8212;Normally,polyethylenehasaverylowdissipationfactor,andatestspecimenexhibitinganabnormallyhighdissipationfactorwouldbesuspectedofcontainingimpuritiesorbeingcontaminated.Thereproducibilityofdissipationfactorbythistestmethodissomewhatbetterthanthatobtainablewiththemoreconventionalmethods,butislimitedbythesensitivityofcommerciallyavailablemeasuringapparatus.1.1Thesetestmethodsprovidetechniquesforthedeterminationoftherelative(Note1)permittivityandthedissipationfactorofsolidinsulatingmaterialsbyfluid(Note2)displacement.Note18212;Incommonusage,theword"relative"isfrequentlydropped.Note28212;Theword"fluid"isacommonlyusedsynonymfor"liquid"andyetagasisalsoafluid.Inthisstandard,theword"fluid"isusedtoshowthatliquidisnotallthatismeant.1.2TestMethodAisespeciallysuitedtotheprecisemeasurementsonpolyethylenesheetingat23176;Candatfrequenciesbetween1kHzand1MHz.Itmayalsobeusedatotherfrequenciesandtemperaturestomakemeasurementsonothermaterialsinsheetform.1.3TestMethodBislimitedtothefrequencyrangeofavailableguardedbridges.Itisespeciallysuitedtomeasurementsonverythinfilmssinceitdoesnotrequiredeterminationofthethicknessofthespecimenyetitprovidesanestimateofthethicknessofthinfilmsthatismoreaccurateandprecisethanthicknessmeasurementsobtainedbyothermeans.1.4TestMethodBisalsousefulformeasurementsofpolymersheetingupto2-mmthickness.1.5Thesetestmethodspermitcalculationofthedissipationfactorofthespecimenstested.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Foraspecificprecautionarystatement,see7.2.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:11P.;A4
【正文语种】: