Designation:D3576−20StandardTestMethodforCellSizeofRigidCellularPlastics1ThisstandardisissuedunderthefixeddesignationD3576;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftheappar-entcellsizeofrigidcellularplasticsbycountingthenumberofcell-wallintersectionsinaspecifieddistance.1.2ProcedureArequiresthepreparationofathinslice,notmorethanonehalftheaveragecelldiameterinthickness,thatismechanicallystable.Formostrigidcellularplasticsthislimitsthetestmethodtomaterialswithanaveragecellsizeofatleast0.2mm.1.3ProcedureBisintendedforusewithmaterialswhosefriablenaturemakesitdifficulttoobtainathinsliceforviewing.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—TheannextoISO2896istechnicallyequivalenttothistestmethod.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD2842TestMethodforWaterAbsorptionofRigidCellularPlasticsD6226TestMethodforOpenCellContentofRigidCellularPlasticsE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ISOStandard:ISO2896CellularPlastics,Rigid—DeterminationofWaterAbsorption33.Terminology3.1Termsusedinthisstan...
