Designation:D4464−15(Reapproved2020)StandardTestMethodforParticleSizeDistributionofCatalyticMaterialsbyLaserLightScattering1ThisstandardisissuedunderthefixeddesignationD4464;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheparticlesizedistributionofcatalyst,catalystcarrier,andcatalyticrawmaterialparticlesandisoneofseveralfoundvaluableforthemeasurementofparticlesize.Therangeofaverageparticlesizesinvestigatedwasfrom1to300µmequivalentsphericaldiameter.Thetechniqueiscapableofmeasuringparticlesaboveandbelowthisrange.Theangleandintensityoflaserlightscatteredbytheparticlesareselectivelymeasuredtopermitcalculationofavolumedistributionusinglight-scatteringtechniques.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D3766TerminologyRelatingtoCatalystsandCatalysisE105PracticeforProbabilitySamplingofMaterialsE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodE1617PracticeforReportingParticleSizeCharacterizationData3.Terminology3.1Definitionsandrecommendednomenc...
