Designation:D1844−86(Reapproved2014)StandardTestMethodsforChemicalAnalysisofBasicLeadSilicochromate1ThisstandardisissuedunderthefixeddesignationD1844;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthechemicalanalysisofthepigmentcommerciallyknownasbasicleadsilicochromateandareapplicabletopigmentsuppliedbythemanufacturerandtopigment,butnotmixedpigments,separatedfromliquidcoatings.ThepresenceofbasicleadsilicochromatespeciesshallbeconfirmedbyX-raydiffractionanalysis(seeSpecifi-cationD1648).1.2Forliquidcoatingsthepigmentmustfirstbeseparatedfromthevehiclebeforeconductingtheanalysis.1.3Theanalyticalproceduresappearinthefollowingorder:SectionsLeadoxide6to14Chromiumtrioxide15to23Silica24to27Moistureandothervolatilematter28Coarseparticles29Oilabsorption30Masscolorandtintingstrength311.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D185TestMethodsforCoarseParticlesinPigmentsD280TestMethodsforHygroscopicMoisture(andOtherMatterVolatileUndertheTestConditions)inPigmentsD281TestMethodforOilAbsorptionofPigmentsbySpatulaRub-outD387TestMethodforColorandStrengthofChromaticPigmentswithaMechanicalMullerD1193SpecificationforReagentWaterD1648SpecificationforBasicLeadSilicochromatePigmentD2371TestMethodforPigmentContentofSolvent-ReduciblePaints3.SignificanceandUse3.1Thesetestmethodsmaybeusedtoconfirmthestatedleadoxide,chromiumtrioxideandsilicacontentofbasicleadsilicochromateandisusefulforqualitycontrol.4.PurityofReagents4.1Rea...
