Designation:D7358−07(Reapproved2018)StandardTestMethodforWaterContentofPaintsbyQuantitativeCalciumHydrideReactionTestKit1ThisstandardisissuedunderthefixeddesignationD7358;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesthedeterminationofthetotalwatercontentofpaintsusingacalciumhydridereactiontestkit,orwatercontentbetween2and85%water.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD3925PracticeforSamplingLiquidPaintsandRelatedPigmentedCoatingsD4017TestMethodforWaterinPaintsandPaintMaterialsbyKarlFischerMethodE29PracticeforUsingSignificantDigitsinTestDatatoDetermineConformancewithSpecifications3.SummaryofTestMethod3.1A0.25mLsampleisreactedwithaspeciallyformulatedcalciumhydridereagenttoconvertwaterinthesampletohydrogengas.Thereactioniscarriedoutinasealedpressurevesselandtheresultingpressureisthenmeasuredusingaspeciallydesignedmeterprogrammedtoconvertgaspressureintowatercontent.Theresultsaredisplayedinmilligramsofwaterinthereactedsampleextract.Theactualweightpercentwaterinthewholepaintsampleismanuallycalculatedusingtheexactweightsofthepaintsampleandthedilutedextractsample...
