Designation:D6280−98(Reapproved2020)StandardSpecificationforZincPhosphatePigments1ThisstandardisissuedunderthefixeddesignationD6280;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthreetypesofpigmentscom-merciallyknownaszincphosphateeachofwhichmayormaynotbeavailableinspecificgradesdelineatedbyparticlesizeoroilabsorption.1.1.1TypeI—ZincPhosphate,dihydratepredominant.1.1.2TypeII—ZincPhosphate,dihydratetetrahydratemix-ture.1.1.3TypeIII—ZincPhosphate,tetrahydratepredominant.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D153TestMethodsforSpecificGravityofPigmentsD185TestMethodsforCoarseParticlesinPigmentsD280TestMethodsforHygroscopicMoisture(andOtherMatterVolatileUndertheTestConditions)inPigmentsD281TestMethodforOilAbsorptionofPigmentsbySpatulaRub-outD1193SpecificationforReagentWaterD1208TestMethodsforCommonPropertiesofCertainPigmentsD1210TestMethodforFinenessofDispersionofPigment-VehicleSystemsbyHegman-TypeGageD2448TestMethodforWater-SolubleSaltsinPigmentsbyMeasuringtheSpecificResistanceoftheLeachateofthePigment3.SignificanceandUse3.1Zincphosphatefunctionsasbothachemicalandapigment.Asapigmentitisusedinavarietyofapplicationsincludingthatofcorrosioninhibitingpaints.4.CompositionandProperties4.1Zincphosphatepigmentisawhitecorrosioninhibitingpigmentconsistingeitherpredominatelyofzincphosphatedihydrate(Zn3(PO4)2·2H2O)oramixtureofzincphosphatedihydrateandz...
