Designation:D185−07(Reapproved2012)StandardTestMethodsforCoarseParticlesinPigments1ThisstandardisissuedunderthefixeddesignationD185;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thesetestmethodscoverthedeterminationoftheamountofcoarseparticlesindrypigments.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E11SpecificationforWovenWireTestSieveClothandTestSieves3.SignificanceandUse3.1Inproductionofpaints,smoothnessofthepaintfilmisofparamountimportance.Agglomeratesorcoarseparticleslargerthan45µmaredifficulttodisperseandmaypreventobtainingasmoothfilm.Thesetestmethodsareavaluablequalitycontroltestforgradingrawmaterials.4.Apparatus4.1Theapparatusshallconsistofa200-mm(8-in.)45-µm(No.325)sieveconformingtoSpecificationE11.An8-in.45-µmsieveforcomparisonpurposesshouldberetainedinthelaboratoryasareferencestandard.Wheneveranewsieveissecured,apracticaltestofitsaccuracyshouldbemadebyrunningonitandonthereferencestandardsieveacomparisontest,usingapigmentthathasaconsiderableamountofcoarseparticles.Areservestockofsuchapigmentshouldbekeptforthispurpose.5.ProcedureforInsolubleDryPigments,ExceptMetallicAluminumandBronzePowders5.1Weighapproximately100gofapigmentspecimentothenearest0.1gonananalyticalbalance.Wetthesieveonbothsideswithwaterandtransferthepigmenttothesieve.5.2Holdthesieveunderatapdeliveringabout300to500mLofthewashliquid(water)perminute.Slightlyshakethesieve...
