Designation:D589–97(Reapproved2002)AnAmericanNationalStandardStandardTestMethodforOpacityofPaper(15°DiffuseIlluminantA,89%ReflectanceBackingandPaperBacking)1ThisstandardisissuedunderthefixeddesignationD589;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)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:D585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProduct2D646TestMethodforGrammageofPaperandPaperboard(MassPerUnitArea)2D685PracticeforConditioningPaperandPaperProductsforTesting2D1968TerminologyRelatingtoPaperandPaperProducts2E122PracticeforCalculatingSampleSizetoEstimate,withaSpecifiedTolerableError,theAverageforCharac-teristicofaLotorProcess3E308PracticeforComputingtheColorsofObjectsbyUsingtheCIESystem42.2TAPPIStandards:TAPPITechnicalInformationSheet0804-03—Interrelationofreflectance,R0;reflectivity,R`;TAPPIopacity,C0.89scattering,s;andabsorption,k5TAPPITechnicalInformationSheet0804-06—Photometriclinearityofopticalpropertiesinstruments5T519Diffuseopacityofpaper(d/0°paperbacking)5T1206Precisionstatementfortestmethods53.Terminology3.1Definitions:Definitions:3.1.1DefinitionsshallbeinaccordancewithTerminologyD1968andtheDictionaryofPaper.5...
