Designation:D1844−86(Reapproved2020)StandardTestMethodsforChemicalAnalysisofBasicLeadSilicochromate1ThisstandardisissuedunderthefixeddesignationD1844;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverthechemicalanalysisofthepigmentcommerciallyknownasbasicleadsilicochromateandareapplicabletopigmentsuppliedbythemanufacturerandtopigment,butnotmixedpigments,separatedfromliquidcoatings.ThepresenceofbasicleadsilicochromatespeciesshallbeconfirmedbyX-raydiffractionanalysis(seeSpecifi-cationD1648).1.2Forliquidcoatingsthepigmentmustfirstbeseparatedfromthevehiclebeforeconductingtheanalysis.1.3Theanalyticalproceduresappearinthefollowingorder:SectionsLeadoxide6to14Chromiumtrioxide15to23Silica24to27Moistureandothervolatilematter28Coarseparticles29Oilabsorption30Masscolorandtintingstrength311.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D185TestMethodsforCoarseParticlesinPigmentsD280TestMethodsforHygroscopicMoisture(andOtherMatterVolatileUndertheTestConditions)inPigmentsD281TestMethodforOilAbsorptionofPigmentsbySpatulaRub-outD387TestMethodforColorandStrengthofChromaticPigmentswithaMechanicalMullerD1193Specificationfo...
