Designation:D7084−04(Reapproved2009)StandardTestMethodforDeterminationofBulkCrushStrengthofCatalystsandCatalystCarriers1ThisstandardisissuedunderthefixeddesignationD7084;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofbulkcrushstrengthofabedofformedcatalystparticles1⁄32to3⁄16in.(0.8to4.8mm)indiameterandisintendedtoprovideinformationconcerningtheabilityofthecatalystmaterialtomaintainphysicalintegrity.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D3766TerminologyRelatingtoCatalystsandCatalysisD4180TestMethodforVibratoryPackingDensityofFormedCatalystParticlesandCatalystCarriersE177PracticeforUseoftheTermsPrecisionandBiasinASTMTestMethodsE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions:3.1.1SeealsoTerminologyD3766.3.1.2bulkcrushstrength—pressurethatgenerates1%finesforasamplecontainedinacylindricalsampleholderandcrushedwithapiston.3.1.3generatedfines—particlesizeaftercrushingthatpassesthroughasieveone-halfofthediameterofthecatalystpellet.4.SummaryofTestMethod4.1Arepresentativesampleisplacedinacylindricalsampleholder,whichisfittedwithapiston.Thepistonisallowedtocompressthecatalystataknownpressure.Thepercentofgeneratedfinesisdeterminedbysieving.5.SignificanceandUse5.1Thistestmethodisameansofdeterm...
