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【英文标准名称】:StandardTestMethodforBrittlenessTemperatureofPlasticsandElastomersbyImpact
【原文标准名称】:用冲击法测定塑料及弹性材料的脆化温度的标准试验方法
【标准号】:ASTMD746-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【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】:D20.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:脆化;弹性材料;冲击试验;塑料;密封件;测试;轮胎
【英文主题词】:brittlefailure;brittlenesstemperature;elastomer;impactplastics
【摘要】:Thistestmethodestablishesthetemperatureatwhich50%ofthespecimenstestedfailwhensubjectedtotheconditionsspecifiedherein.Thetestprovidesfortheevaluationoflong-timeeffectssuchascrystallization,orthoseeffectsthatareintroducedbylow-temperatureincompatibilityofplasticizersinthematerialundertest.Plasticsandelastomersareusedinmanyapplicationsrequiringlow-temperatureflexingwithorwithoutimpact.Usedataobtainedbythismethodtopredictthebehaviorofplasticandelastomericmaterialsatlowtemperaturesonlyinapplicationsinwhichtheconditionsofdeformationaresimilartothosespecifiedinthistestmethod.Thistestmethodhasbeenfoundusefulforspecificationpurposes,butdoesnotnecessarilymeasurethelowesttemperatureatwhichthematerialissuitableforuse.FIG.1DimensionalRequirementsBetweenSpecimenClampandStrikingEdge(TypeA)FIG.2TypicalClamp(TypeA)Note8212;Dimensionsareinmillimetres.FIG.3DimensionalDetailsofStrikingEdgeandClampingDevice,TypeB(PositioningofUnnotchedTestSpecimen)FIG.4AssembledClampwithTestSpecimens,TypeB1.1Thistestmethodcoversthedeterminationofthetemperatureatwhichplasticsandelastomersexhibitbrittlefailureunderspecifiedimpactconditions.Tworoutineinspectionandacceptanceproceduresarealsoprovided.Note18212;WhentestingrubbersforimpactbrittlenessuseTestMethodsD2137.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Duetothepotentialsafetyandenvironmentalhazardsassociatedwithmercury-filledthermometers,theuseofalternativetemperaturemeasuringdevices(suchasthermocouplesandRTDs)isencouraged.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note28212;ThistestmethodandISO974(E)aretechnicallyequivalentwhenusingtheTypeBfixtureandtheTypeIIIspecimen,however,theminimumnumberofspecimensthatarerequiredtobetestedissignificantlydifferentwhenusingthistestmethod.TheISOmethodrequiresthataminimumof100specimensbetested.
【中国标准分类号】:G31
【国际标准分类号】:
【页数】:8P.;A4
【正文语种】: