Designation:D5802–95(Reapproved2001)AnAmericanNationalStandardStandardTestMethodforSorptionofBibulousPaperProducts(SorptiveRateandCapacityUsingGravimetricPrinciples)1ThisstandardisissuedunderthefixeddesignationD5802;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONTheinteractionofwaterineitherthegaseousorliquidstateisanextremelyimportantpropertyofpaperandpaperproducts.Inadditiontobeingthebasisforperformancecharacteristicsofvariousdifferenttypesofpaper,suchaspaperforprintingandwriting,paperforwrappingandpackaging,andpaperforliquidabsorbingtasks,measuredvaluesformanyofthephysicalpropertiesofpapervary,dependingupontheamountofwaterpresentinthesheetwhenitistested.TheamountofmoisturepresentinpaperandpaperproductsmaybemeasuredbyproceduressuchasTestMethodD644.Toenablephysicalmeasurementsondifferentpapermaterialstobeeasilycompared,equilibrationofspecimenstoastandardmoisturecontentbeforetestingisdoneusingproceduressuchasPracticeD685.Wherepapermaterialsaretobeusedasbarrierstothetransferofwatervaporin,forexample,packagingorwrappingapplications,theirgaseousmoisturebarrierpropertiesmaybemeasuredbyTAPPIT523.AmethodformeasuringthebarrierpropertiesofsimilarpapermaterialstoliquidwaterisfoundinTestMethodD3285.Wheretheinteractionbetweenapapermaterialandaliquidisimportantinanapplicationsuchasprinting,measurementsmaybemadeusingproceduressuchasTestMethodsD5455,andTestMethodsD724.Wherepapermaterialsarerequiredwhichwillabsorbandretainwaterorwaterbasedfluids,asforexample,absorbenttissueorblottingpapers,testmethodssuchasTestMethodsD824,D2177,orD4250,maybeuseful.Thefirsttwoofthesemethodsmeasureabsorbentrate,thethird,absorptivecapacity.SimilartestmethodsforabsorptiveratearefoundinTAPPIT431andT432.TheabsorbencyofpaperboardismeasuredusingTAPPIT491,whichoperatesonthesamegravimet...
