Designation:D1366−86(Reapproved2019)StandardPracticeforReportingParticleSizeCharacteristicsofPigments1ThisstandardisissuedunderthefixeddesignationD1366;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thispracticeforreportingthefinenesscharacteristicsofpigmentsisdesignedtoapplyinmostcaseswherewell-knownmethodsfordeterminingtheseparticlesizecharacteristicsinthesubsieverangeareemployed,suchasmicroscopic,sedimentation,andturbidimetricmethods;andpartiallytoabsorptionandpermeabilitymethods.1.2Laminar,plate-likepigmentsandcompositepigmentshavingadefinitebimodaldistributionarenotconsideredwithinthescopeofthispractice.1.3Parameters—Thefinenesscharacteristicsarereportedinthefollowingthreeparameters:1.3.1ParticleSizeParameter.1.3.2CoarsenessParameter—Aparameterdescriptiveofthecoarsenesscharacterofthepigment,makinguseofalimitingvalueinthesubsieverangesimilartothatusedinthesieveranges.1.3.3DispersionParameter—Aparameterdescriptiveoftheuniformityoftheparticlesizedistribution.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2E20PracticeforParticleSizeAnalysisofParticulateSub-stancesintheRangeof0.2to75MicrometresbyOpticalMicroscopy(Withdrawn1994)33.Terminology3.1Defini...
