Designation:D3906−03(Reapproved2013)StandardTestMethodforDeterminationofRelativeX-rayDiffractionIntensitiesofFaujasite-TypeZeolite-ContainingMaterials1ThisstandardisissuedunderthefixeddesignationD3906;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthedeterminationofrelativeX-raydiffractionintensitiesofzeoliteshavingthefaujasitecrystalstructure,includingsyntheticYandXzeolites,theirmodificationssuchasthevariouscationexchangeforms,andthedealuminized,decationated,andultrastableformsofY.Thesezeoliteshavecubicsymmetrywithaunitcellparameterusuallywithinthelimitsof24.2and25.0˚Å(2.42and2.50nm).1.2Thesamplesincludezeolitepreparationsinthevariousforms,andcatalystsandadsorbentscontainingthesezeolites.1.3Theterm“intensityofanX-raypowderdiffraction(XRD)peak”isthe“integralintensity,”eithertheareaofcountsunderthepeakortheproductofthepeakheightandthepeakwidth.1.4ThistestmethodprovidesanumberthatistheratioofintensityofportionsoftheXRDpatternofthesampletointensityofthecorrespondingportionofthepatternofareferencezeolite,NaY.(LaboratoriesmayuseamodifiedYorX,forexample,REYasasecondarystandard.)Theintensityratio,expressedasapercentage,isthenlabeled“%XRDintensity/NaY.”1.5Undercertainconditionssucharatioisthepercentzeoliteinthesample.Theseconditionsinclude:1.5.1Thezeoliteinthesampleisthesameasthereferencezeolite.1.5.2TheabsorptionfortheX-raysusedisthesameforthezeoliteandthenonzeoliteportionsofthesample.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456T...
