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【英文标准名称】:Open-CellContent(Porosity)ofRigidCellularPlasticsbytheAirPycnometer,TestMethodfor(08.02)
【原文标准名称】:用空气比重瓶测定硬质泡沫塑料的开孔率(孔隙率)的试验方法(08.02)
【标准号】:ANSI/ASTMD2856-1994
【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】:试验;含量测定;塑料;泡沫橡胶
【英文主题词】:foamedrubber;determinationofcontent;plastics;testing
【摘要】:Cellularplasticsarecomposedofthemembranesorwallsofpolymerseparatingsmallcavitiesorcells.Thesecellsmaybeinterconnecting(opencell),non-connecting(closedcell),oranycombinationofthesetypes.Thistestmethoddeterminesnumericalvaluesforopencells.Itisaporositydetermination,measuringtheaccessiblecellularvolumeofamaterial.Thevolumeoccupiedbyclosedcellsisconsideredtoincludecellwalls.Sinceanyconvenientlysizedspecimencanonlybeobtainedbysomecuttingoperation,afractionoftheclosedcellswillbeopenedduringsamplepreparationandwillbeincludedasopencells.Thistestmethodconsistsofthreeprocedures:ProcedureA,designedtocorrectforcellsopenedduringsamplepreparation,bymeasuringcelldiameter,calculating,andallowingforsurfacevolume;ProcedureB,designedtocorrectforcellsopenedinsamplepreparation,bycuttingandexposingnewsurfaceareaequaltothesurfaceareaoftheoriginalsampledimension,andProcedureC,whichdoesnotcorrectforcellsopenedduringsamplepreparationandgivesgoodaccuracyonpredominantlyhighlyopen-celledmaterials.Theaccuracydecreasesastheclosedcellcontentincreasesandasthecellsizeincreases.ThevaluesasstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesaregivenforinformationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecificprecautionarystatementsaregiveninNotes2,4,and8.Note1-ThistestmethodandISO4590-1981usethesamebasicprinciplesbutaresignificantlydifferentinexperimentaldetail.
【中国标准分类号】:G31
【国际标准分类号】:83_100
【页数】:
【正文语种】:英语