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【英文标准名称】:PracticeforHeatAgingofOxidativelyDegradablePlastics
【原文标准名称】:可氧化降解塑料的加热老化实施规程
【标准号】:ANSI/ASTMD5510-1994
【标准状态】:现行
【国别】:美国
【发布日期】:1994
【实施或试行日期】:
【发布单位】:美国国家标准学会(US-ANSI)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:塑料;脆裂
【英文主题词】:embrittlement;plastics
【摘要】:hispracticeisintendedtodefinetheexposureconditionsofplasticsatvarioustemperatureswhenexposedsolelytohotairforextendedperiodsoftime.Onlytheproceduresforheatexposurearespecified,notthetestmethodorspecimen.Theeffectofheatonanyparticularpropertymaybedeterminedbyselectionoftheappropriatetestmethodandspecimen;however,itisrecommendedthatPracticeD3826beusedtodeterminetheembrittlementendpoint,whichisdefinedasthatpointinthehistoryofamaterialwhen75%ofthespecimenstestedhaveatensileelongationatbreakof5%orlessataninitialstrainrateof0.1mm/mmmin.Thispracticeshouldbeusedasaguideforcomparingthethermal-agingcharacteristicsofmaterialsasmeasuredbythechangeinsomepropertyofinterest(thatis,embrittlementbymeansoflossofelongation).ItisverysimilartoPracticeD3045butisintendedforuseinevaluatingplasticsdesignedtobeoxidizedeasilyafteruse.TheexposuretimesusedforthispracticewillbesignificantlyshorterthanthoseusedforPracticeD3045.Thetypeofovenusedcanaffecttheresultsobtainedfromthispractice.Theusercanuseoneoftwomethodsforovenexposure.Theresultsbasedononemethodshouldnotbemixedwiththosebasedontheother.ProcedureA:Gravity-ConvectionOven-Recommendedforfilmspecimenshavinganominalthicknessnotgreaterthan0.25mm(0.010in.).ProcedureB:Forced-VentilationOven-Recommendedforspecimenshavinganominalthicknessgreaterthan0.25mm(0.010in.).Thispracticerecommendsproceduresforcomparingthethermalagingcharacteristicsofmaterialsatasingletemperature.Recommendedproceduresfordeterminingthethermalagingcharacteristicsofamaterialataseriesoftemperaturesforthepurposeofestimatingtimetoadefinedpropertychangeatsomelowertemperaturearealsodescribed.Thispracticedoesnotpredictthermalagingcharacteristicswhereinteractionsbetweenstress,environment,temperature,andtimecontrolfailure.ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note1-ThereisnoISOstandardthatisequivalenttothisstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_140_99
【页数】:
【正文语种】:英语