Designation:D4288−02(Reapproved2019)StandardSpecificationforCalciumBorosilicatePigments1ThisstandardisissuedunderthefixeddesignationD4288;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthreegradesofpigmentcom-merciallyknownascalciumborosilicatecompositepigment.ThetwotypesdifferinchemicalcompositionwhilethetwoclassesofTypeIdifferinoilabsorption.1.2Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C958TestMethodforParticleSizeDistributionofAluminaorQuartzbyX-RayMonitoringofGravitySedimentationD185TestMethodsforCoarseParticlesinPigmentsD281TestMethodforOilAbsorptionofPigmentsbySpatulaRub-outD1366PracticeforReportingParticleSizeCharacteristicsofPigmentsD3360TestMethodforParticleSizeDistributionbyHy-drometeroftheCommonWhiteExtenderPigments(Withdrawn2003)3D4487TestMethodsforAnalysisofCalciumBorosilicate3.CompositionandProperties3.1Alltypesofpigmentshallconsistofacomplexcom-positeofalkalineearthsilicatesandboratesandshallconformtotherequirementsofTable1.3.2Themasscolorofthedrypigmentiswhite.Theshadeandtintingstrengthwhenspecifiedshallbeequaltothatofareferencesamplemutuallyagreeduponbetweenthepurchaserandtheseller.3.3ParticleSize:3.3.1Alltypesarecharacterizedbymajoramountsofparticlesinthe1to10-µmrange.Coarseparticlesretainedona45-µm(No.325)sieveshallbelessthan0.3%.Themaximumspecificsurfacediameter(SSD)shallbe2.5-µm.3.3.2Whereclosercontrolwithinaclassortypeisrequired,thefinenessrequirementsshallbeasagreeduponbetweenthepurchaserandtheseller.4.Sampling4.1Twosampless...
