Designation:E2980−14StandardTestMethodsforEstimatingAverageParticleSizeofPowdersUsingAirPermeability1ThisstandardisissuedunderthefixeddesignationE2980;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodsuseairpermeabilitytodetermineanenvelope-specificsurfaceareaanditsassociatedaverageequivalentsphericaldiameter(from0.2to75µm)ofpowders.Twotestmethodsaredescribed:Onetestmethodforinorganicmaterials(TestMethod1),andanothertestmethodfororganicmaterials(TestMethod2).Thevaluesobtainedarenotintendedtobeabsolutebutaregenerallyusefulonarelativebasisforcontrolpurposes.1.2Units—Withtheexceptionofthevaluesfordensityandthemassusedtodeterminedensity,forwhichtheuseofthegrampercubiccentimetre(g/cm3)andgram(g)unitsisthelongstandingindustrypractice;andtheunitsforpressure,cmH2O—alsolong-standingpractice;thevaluesinSIunitsaretoberegardedasstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B330TestMethodsforEstimatingAverageParticleSizeofMetalPowdersandRelatedCompoundsUsingAirPer-meabilityB859PracticeforDe-AgglomerationofRefractoryMetalPowdersandTheirCompoundsPriortoParticleSizeAnalysisE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecificationsE1638TerminologyRelatingtoSieves,SievingMethods,andScreeningMediaE2589TerminologyRelatingtoNonsievingMethodsofPowderCharacterization2.2ISODocuments:3ISO10070MetallicPowders:DeterminationsofEnvelope-SpecificSurfaceAreafromMeasurementsofthePerme-abilitytoAirofaPowderBedUnderSteady-StateFlowConditions3.Terminology3.1Definitions—Manytermsusedinthistestmetho...
