Designation:D6290−19StandardTestMethodforColorDeterminationofPlasticPellets1ThisstandardisissuedunderthefixeddesignationD6290;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodisusedfortheinstrumentalmeasure-mentofthedegreeofyellowness(orchangeofdegreeofyellowness)underdaylightilluminationofhomogeneous,nonfluorescent,nearly-colorlesstransparentornearly-whitetranslucentoropaqueplastics.Themeasurementismadeonpelletsandbasedontristimulusvaluesobtainedwithaspec-trophotometerorcolorimeter.1.2Thistestmethodisapplicabletothecoloranalysisofplasticpellets.Itispossiblethateachmaterialwillhaveuniquecharacteristicsthatdeterminethecolorvalues.1.3Thisprocedureoutlinesamethodtodeterminecolormeasurements,suchasYellownessIndex(YI),CIEX,Y,Z,andHunterL,a,b,orCIEL*,a*,b*.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.NOTE1—ThisstandardandISO17223addressthesamesubjectmatterbutdifferintechnicalcontent.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD2244PracticeforCalculationofColorTolerancesandColorDifferencesfromInstrumentallyMeasuredColorCoordinatesE179GuideforSelectionofGeometricConditionsforMeasurementofReflectionandTransmissionProperties...
