Designation:D7133−11StandardTestMethodforPolyurethaneRawMaterials:InstrumentalMeasurementofTristimulusCIELABColorandYellownessIndexofLiquids1ThisstandardisissuedunderthefixeddesignationD7133;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThistestmethodprovidesaninstrumentalmethodformeasuringtheCIELABcolorandYellownessIndex(YI)ofliquidpolyurethanerawmaterials.TheCIELABandYIresultsarederivedfrommathematicalmanipulationofCIEtristimulusvaluesinaccordancewithPracticesE308andE313,respec-tively.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.NOTE1—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D883TerminologyRelatingtoPlasticsD1193SpecificationforReagentWaterE180PracticeforDeterminingthePrecisionofASTMMethodsforAnalysisandTestingofIndustrialandSpe-cialtyChemicals(Withdrawn2009)3E284TerminologyofAppearanceE308PracticeforComputingtheColorsofObjectsbyUsingtheCIESystemE313PracticeforCalculatingYellownessandWhitenessIndicesfromInstrumentallyMeasuredColorCoordinatesE691PracticeforConductinganInterlaboratoryStudytoDeterminethePrecisionofaTestMethod3.Terminology3.1Definitions—Fordefinitionsoftermsthatappearinthistestmethod,refertoTerminologiesE284,D883,andtheterminologysectionofPracticeE308.4.SummaryofTestMethod4.1ThecolorofthetotaltransmittedlightismeasuredbyaspectrophotometerinCIEtristimulusvaluesunderCIEstan-dardilluminantD65andCIE1964supplementarystandardobservercommonlycalledthe10°standardobserver.ThesevaluesarethenconvertedbytheappropriateequationstotheCIELABcolorscaleandtheYellownessIndex.L*a*b*andYIvaluesarereported.5.Signifi...
