Designation:D478−02(Reapproved2019)StandardSpecificationforZincYellow(ZincChromate)Pigments1ThisstandardisissuedunderthefixeddesignationD478;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thisspecificationcoversthepigmentscommerciallyknownaszincyellow(zincchromate).1.2Twotypesareincluded:1.2.1TypeI—High-purity,lowsulfateandchloridecontent.1.2.2TypeII—Regulargrade.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesareforinformationonly.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D185TestMethodsforCoarseParticlesinPigmentsD387TestMethodforColorandStrengthofChromaticPigmentswithaMechanicalMullerD444TestMethodsforChemicalAnalysisofZincYellowPigment(ZincChromateYellow)3.SignificanceandUse3.1Zincyellowisusedinrust-inhibitingprotectivecoatingsandmetalprimersforferrousandnon-ferrousmetals.4.CompositionandProperties4.1DryPigment—Thepigmentshallbeareactionprecipi-tateofsolublechromatesandasuitablezinccompoundandshallbefreeofextenders,carbonates,andorganiccolorinanyform.ThepigmentshallconformtotherequirementsforcompositionprescribedinTable1.4.2Themasscolorandcharacterofthetintandthetintingstrengthformedbyamixturewithawhitepigmentshallbewithinmutuallyagreeduponlimitsofastandardacceptabletoboththepurchaserandtheseller.5.Sampling5.1Twosamplesshallbetakenatrandomfromdifferentpackagesfromeachlot,batch,day’spack,orotherunitofproductioninashipment.Whennomarkingsdistinguishingbetweenunit...
