Designation:D589–97(Reapproved2007)AnAmericanNationalStandardStandardTestMethodforOpacityofPaper(15°DiffuseIlluminantA,89%ReflectanceBackingandPaperBacking)1ThisstandardisissuedunderthefixeddesignationD589;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftheopacityofpaper.1.2Twodifferenttypesof“white”backingarespecified,leadingtotwodifferentopacityvalues,inaccordancewithSection3.1.3Thistestmethodemploys15°diffusegeometry,Illumi-nantA/2°and89%reflectancebackingorpaperbacking.Forthemeasurementofopacitywithd/0°geometry,IlluminantC/2°andpaperbacking(seeTAPPIT519).1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProductD646TestMethodforGrammageofPaperandPaperboard(MassPerUnitArea)D685PracticeforConditioningPaperandPaperProductsforTestingD1968TerminologyRelatingtoPaperandPaperProductsE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcessE308PracticeforComputingtheColorsofObjectsbyUsingtheCIESystem2.2TAPPIStandards:3TAPPITechnicalInformationSheet0804-03—Interrelationofreflectance,R0;reflectivity,R`;TAPPIopacity,C0.89scattering,s;andabsorption,kTAPPITechnicalInformationSheet0804-06—PhotometriclinearityofopticalpropertiesinstrumentsT519Diffuseopacityofpaper(d/0°paperbacking)T1206Precisionstatementfortestmethods3.Terminology3.1Definitions:3.1.1DefinitionsshallbeinaccordancewithTerminologyD1968andtheDictionaryofPaper.33.2DefinitionsofTermsSpec...
