Designation:D5757−11(Reapproved2017)StandardTestMethodforDeterminationofAttritionofFCCCatalystsbyAirJets1ThisstandardisissuedunderthefixeddesignationD5757;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthedeterminationoftherelativeattritioncharacteristicsofFCCcatalystsbymeansofairjetattrition.OtherfinepowdercatalystscanbeanalyzedbythistestmethodbuttheprecisionofthistestmethodhasbeendeterminedonlyforFCCcatalysts.Itisapplicabletospheri-callyorirregularlyshapedparticleswhichrangeinsizebetween10and180µm,haveskeletaldensitiesbetween2.4and3.0g/cm3(2400and3000kg⁄m3)(seeIEEE/ASTMSI-10)andareinsolubleinwater.Particleslessthan20µmareconsideredfines.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethodIEEE/ASTMSI-10StandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem23.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1AirJetIndex(AJI)—aunitlessvaluenumericallyequaltothepercentattritionlossat5h.4.SummaryofTestMethod4.1Asampleofdriedpowderishumidifiedandattritedbymeansofthreehighvelocityjetsofhumidifiedair.Thefinesarecontinuouslyremovedfromtheattritionzonebyelutriationintoafinescollectionassembly.4.2TheAJIiscalculatedfromtheelutriatedfinestogivearelativeestimateoftheattritionresistanceofthepowder...
