Designation:D2448−85(Reapproved2019)StandardTestMethodforWater-SolubleSaltsinPigmentsbyMeasuringtheSpecificResistanceoftheLeachateofthePigment1ThisstandardisissuedunderthefixeddesignationD2448;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthespecificresistanceoftheaqueousleachatefromapigmentasanindexofwater-solublesaltcontent.Thistestmethodisapplicabletowhitepigmentsandcoloredpigments(organicandinorganic).Thewater-solublesaltscontentisafunctionofthespecificresistanceofthesolutionformedbyextractingthepigmentwithwater.1.2Thistestmethodisbasedonawatertopigmentratioof9+1.Theleachateyield(minimum160mL)sufficientforrinsingthecylinderdipcellandthermometerplusthemini-mum80mLrequiredforthemeasurementtodeterminethequantityofpigmenttobeused.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Aweighedquantityofpigmentisaddedtowaterandboiled.Forhydrophobicpigmentsmethylalcoholisusedtofacilitatewetting.Afterfiltration,thespecificresistanceofthefiltrateisdeterminedusingaconductivitybridge.4.SignificanceandUse4.1Thistestmethodprovidesareliablemean...
