Designation:B821−10(Reapproved2016)StandardGuideforLiquidDispersionofMetalPowdersandRelatedCompoundsforParticleSizeAnalysis1ThisstandardisissuedunderthefixeddesignationB821;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidecoversthedispersioninliquidsofmetalpowdersandrelatedcompoundsforsubsequentuseinparticlesizeanalysisinstruments.Thisguidedescribesageneralprocedureforachievinganddeterminingdispersion;italsolistsproceduresthatarecurrentlyingeneraluseforcertainmaterials.1.2Thisguideislimitedtometalpowdersandrelatedmetalcompounds.However,thegeneralproceduredescribedhereinmaybeused,withcautionastoitssignificance,forotherparticulatematerials,suchasceramics,pigments,minerals,etc.1.3Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2B243TerminologyofPowderMetallurgyB430TestMethodforParticleSizeDistributionofRefrac-toryMetalPowdersandRelatedCompoundsbyTurbidi-metryB761TestMethodforParticleSizeDistributionofMetalPowdersandRelatedCompoundsbyX-RayMonitoringofGravitySedimentationB822TestMethodforParticleSizeDistributionofMetalPowdersandRelatedCompoundsbyLightScattering3.Terminology3.1Definitions—DefinitionsofpowdermetallurgytermscanbefoundinTerminologyB243.4.SignificanceandUse4.1Themethodofpowderdispersioninaliquidhasasignificanteffectontheresultsofaparticlesizedistributionanalysis.Theanalysiswillshowatoo-coarse,unstable,ornonrepeatabledistributionifthepowderhasnotbeendispersedadequately.Itisthereforeimportantthatpa...
