Designation:E194−10(Reapproved2015)StandardTestMethodforAcid-InsolubleContentofCopperandIronPowders1ThisstandardisissuedunderthefixeddesignationE194;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethod2coversthedeterminationofthemineral-acid-insolublemattercontentofcopperandironpow-dersinamountsunder1.0%.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3B215PracticesforSamplingMetalPowdersE50PracticesforApparatus,Reagents,andSafetyConsid-erationsforChemicalAnalysisofMetals,Ores,andRelatedMaterialsE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.SummaryofTestMethod3.1Thesampleisdissolvedintheappropriateacid:nitricacid(HNO3)forcopper,hydrochloricacid(HCl)foriron.Theinsolublematterisfilteredoutandignitedinafurnaceat980°Cfor1h.4.SignificanceandUse4.1Thepurposeofthistestmethodistodeterminetheamountofgangue,refractory,inert,etc.,materials,thatmayadverselyaffectcompactingtoolsandsinteredpropertiesofcomponentsformedfromcopperandironpowders.4.2Theinsolublematterconsistsofthosenonmetallicsubstancesthatdonotdissolveinthemineralacidusedtodissolvethemetal.Incopperpowder,whichistreatedwithnitricacid,theacid-insolublematterincludessilica,insolublesilicates,alumina,clays,andotherrefractorymaterialsthatmaybeintroducedeitherasimpuritiesintherawmaterialorfromthefurnacelining,fuel,etc.;leadsulfatemayalsobepresent.Inironpowder,whichistreatedwithhydrochloricacid,theinsolublemattermayincludecarbidesinadditiontothesubstanceslistedabove.Thetestmethodexcludesinsolublematerialthatisvolatileattheigniti...
