Designation:D605−82(Reapproved2012)StandardSpecificationforMagnesiumSilicatePigment(Talc)1ThisstandardisissuedunderthefixeddesignationD605;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoverspigmentsthatconsistsubstan-tiallyofnaturalhydrousmagnesiumsilicate,andisrestrictedtothosemineralsthatconformtothechemicallimitsprescribedhereinandcanbesuitablyprocessedtowhatiscommerciallyknownaspaintpigmentquality.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thefollowinghazardcaveatappliestothetestmethodportionofthisspecificationonly.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D280TestMethodsforHygroscopicMoisture(andOtherMatterVolatileUndertheTestConditions)inPigmentsD281TestMethodforOilAbsorptionofPigmentsbySpatulaRub-outD562TestMethodforConsistencyofPaintsMeasuringKrebsUnit(KU)ViscosityUsingaStormer-TypeViscom-eterD717TestMethodsforAnalysisofMagnesiumSilicatePigmentD1208TestMethodsforCommonPropertiesofCertainPigmentsD1210TestMethodforFinenessofDispersionofPigment-VehicleSystemsbyHegman-TypeGage3.CompositionandProperties3.1Thepigmentshallbemadebygrindingorotherwiseprocessingnatural,hydrousmagnesiumsilicateandshallconformtothefollowingrequirements:Weight%minmaxCombinedmagnesiumandcalciumsili-cates(MgOplusSiO2plusCaO)88...Calciumoxide(CaO)...10Aluminumandironoxides(R2O3)...6Lossonignition...7Moistureandothervolatilematerial...13.2Color—Thecolorshallbeequal,withinagreedupontolerances,tothatofareferencesampleagreeduponbetweenthepurchaserandtheseller.3....
