Designation:D604–81(Reapproved1996)e1StandardSpecificationforDiatomaceousSilicaPigment1ThisstandardisissuedunderthefixeddesignationD604;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.e1NOTE—KeywordswereaddededitoriallyinMay1996.1.Scope1.1Thisspecificationcoverstwotypesofdiatomaceoussilicapigmentsforuseinpaints:1.1.1TypeA—Standardfinenessforgeneralpaintuse.1.1.2TypeB—Extrafine,forspecialuses.NOTE1—Silicapigmentsoriginatingfromcrystallinerocksorsandsarenotcoveredbythisspecification.NOTE2—Foradditionalinformation,seeTestMethodsD719.2.ReferencedDocuments2.1ASTMStandards:D185TestMethodsforCoarseParticlesinPigments,Pastes,andPaints2D719TestMethodsforAnalysisofDiatomaceousSilicaPigment2D1208TestMethodsforCommonPropertiesofCertainPigments23.CompositionandProperties3.1Thepigmentshallbeadiatomaceoussilicaespeciallyproducedbychemical,heat,andgradingprocesses,andse-lectedforuseinpaintsandshallconformtothefollowingrequirements:Lossonignition,max.,%1.0MattersolubleinHCl(1+2),max,%3.0Moistureandothervolatilematter,max,%1.0Volumeofsettledpigmentinpetroleumspiritsafter1h,min,mL:TypeA35TypeB25Coarseparticles(totalresidueretainedona45-µm(No.325)sieve),%:TypeA5.0to15.0TypeB1.0max3.2Thecolorshallbewithinmutuallyagreeduponlimitsofareferencesampleacceptabletoboththepurchaserandtheseller.4.Sampling4.1Twosamplesshallbetakenatrandomfromdifferentpackagesfromeachlot,batch,day’spack,orotherunitofproductioninashipment.Whennomarkingsdistinguishingbetweenunitsofproductionappear,samplesshallbetakenfromdifferentpackagesintheratiooftwosamplesforeach10000lb(4540kg),exceptthatforshipmentsoflessthan10000lbtwosamplesshallbetaken.Attheoptionofthepurchaser,thesamplesmaybetestedseparatelyorafterblendinginequalquantitiesthesamplesfromthesameproductionunittoformacompositesample.5.TestMethods5....
