Designation:D1921−12StandardTestMethodsforParticleSize(SieveAnalysis)ofPlasticMaterials1ThisstandardisissuedunderthefixeddesignationD1921;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*1.1Thesetestmethodscoverthemeasurementoftheparticlesizeofplasticmaterialsinthepowdered,granular,orpelletedformsinwhichtheyarecommonlysupplied.Asthesetestmethodsutilizedrysieving,thelowerlimitofmeasure-mentisconsideredtobeabout38µm(No.400sieve).Forsmallerparticlesizes,sedimentationtestmethodsarerecom-mended.1.2Twotestmethodsaredescribed:1.2.1TestMethodA—Thistestmethodusesmultiplesievesselectedtospantheparticlesizeofthematerial.Thismethodisusedtodeterminethemeanparticlediameterandparticlesizedistribution.1.2.2TestMethodB—ThistestmethodisanabbreviatedversionofTestMethodAconductedwithafewspecificsieves.Thistestmethoddetermines“percentpassing”or“percentretained”onagivensieve.TestMethodBisapplicabletomaterialswhichdonothaveanormalparticlesizedistributionsuchaspelletsandcubes.1.3ThevaluesstatedinSIunitsshallbeconsideredstandardfordimensionsofthewireclothopeningsandthediameterofthewiresusedinthewirecloth.Thevaluesstatedininch-poundunitsshallbeconsideredstandardwithregardtothesieveframes.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalentforthistestmethod.2.ReferencedDocuments2.1ASTMStandards:2E11SpecificationforWovenWireTestSieveClothandTestSievesE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SummaryofTestMethods3.1Adrymassofplasticmaterialisp...
