~ASTMDI72570075953000236337[[TbDesignation:D1925-70(Reapproved1988)"AnAmericanNationalStandardAMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceSI..Philadelphia,Pa.19103ReprintedfromtheAnnualBookofASTMStandards.CopyrightASTMIfnotlistedinlhecurrentcombinedindex.willappearinthenextedition.StandardTestMethodforYellownessIndexofPlastics'ThisstandardisissuedunderthefixeddesignationD1925;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.'INOTE-Section1.3wasaddededitoriallyOctober1988.1.Scope1.1Thistestmethodisintendedprimarilyfordeter-miningthedegreeofyellowness(orchangeofdegreeofyellowness)underday-lightilluminationofhomogeneous,nonfluorescent,nearlycolorlesstransparentornearlywhitetranslucentoropaqueplastics.Itisapplicabletotransmit-tanceoftransparentandtranslucentplasticsandtoreflec-tanceofopaqueplastics(Note1).ItisbasedupontristimulusvaluescalculatedfromdataobtainedontheHardy-G.E.-typespectrophotometer,*butotherapparatusissatisfactoryifequivalentresultsareobtained.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.NOTEI-Thistestmethodhasnotbeendemonstratedforthedeterminationoftransmittedyellownessofplasticshavingaluminoustransmittancebelow25%,andithasnotbeendemonstratedforthedeterminationofreflectedyellownessoftranslucentplastics.1.3Thisstandardmayinvolvehazardousmaterials,oper-ations,andeqicipment.Thisstandarddoesnotpurporttoaddressallofthesafetyproblemsassaciatedwithitsiae.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregitlatorylimitationspriortouse.2.ReferencedDocuments2.!.-lSï'híStandards:D618MethodsofConditioningPlasticsandElectricalE259RecommendedPracticeforPreparationofRefer-E308MethodforComputingtheColorsofObjectsbyInsulatingMaterialsforTesting3enceWhiteReflectanceStandards4Using...
