Designation:B430–97(Reapproved2006)e1StandardTestMethodforParticleSizeDistributionofRefractoryMetalPowdersandRelatedCompoundsbyTurbidimetry1ThisstandardisissuedunderthefixeddesignationB430;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.e1NOTE—MultiplesourcefootnoteswereremovededitoriallyinMay2006.1.Scope1.1Thistestmethodcoversthedeterminationofparticlesizedistributionofrefractorymetalpowderswithaturbidime-ter(1).2Experiencehasshownthatthistestmethodissatisfactoryfortheanalysisofelementaltungsten,molybde-num,rhenium,tantalummetalpowders,andtungstencarbidepowders.Otherrefractorymetalpowders,forexample,el-ementalmetals,carbides,andnitrides,maybeanalyzedusingthistestmethodwithcautionastosignificanceuntilactualsatisfactoryexperienceisdeveloped.Theprocedurecoversthedeterminationofparticlesizedistributionofthepowderintwoconditions:1.1.1Asthepowderissupplied(as-supplied),and1.1.2Afterthepowderhasbeende-agglomeratedbyrodmilling(laboratorymilled)accordingtoPracticeB859.1.2Wheredualunitsaregiven,inch-poundunitsaretoberegardedasstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3B330TestMethodforFisherNumberofMetalPowdersandRelatedCompoundsB821GuideforLiquidDispersionofMetalPowdersandRelatedCompoundsforParticleSizeAnalysisB859PracticeforDe-AgglomerationofRefractoryMetalPowdersandTheirCompoundsPriortoParticleSizeAnalysisE456TerminologyRelatingtoQualityandStatisticsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod2.2ASTMAdjunct:4Turbidi...
