Designation:D8352−20StandardTestMethodforDeterminationofRelativeCrystallinityofZeoliteBetabyX-RayDiffraction1ThisstandardisissuedunderthefixeddesignationD8352;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversaprocedurefordeterminationoftherelativecrystallinityofzeoliteBetacontainingsamplesusingselectedpeaksfromtheX-raydiffraction(XRD)patternofthezeolite.1.2ThetestmethodprovidesanumberthatistheratioofintensityofaportionoftheXRDpatternofthesamplezeoliteBetatointensityofthecorrespondingportionofthepatternofareferencezeoliteBeta.Theintensityratio,expressedasapercentage,isthenlabeledpercentXRDrelativecrystallinityofzeoliteBeta.Thistypeofcomparisoniscommonlyusedinzeolitetechnologyandisoftenreferredtoaspercentcrystal-linity.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SummaryofTestMethod3.1ThismethodappliestozeoliteBetasampleswithaveragecrystallitesize>150nm.XRDpatternsofthesamplezeoliteBetaandthereferencezeoliteBetaareobtainedunderthesameconditions.Fromthesepatterns,thereisachoicefromtwoproceduresforcalculationofrelativecrystallinityofzeoliteBeta.3.2ProcedureA(Integ...
