Designation:D824–94(Reapproved2007)AnAmericanNationalStandardStandardTestMethodforRateofAbsorptionofWaterbyBibulousPapers1ThisstandardisissuedunderthefixeddesignationD824;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationoftherateatwhichanunsizedandabsorbentpaperwillabsorbwaterbymeasuringthetimerequiredforthepapertoabsorbcompletelyaspecifiedquantityofwater(1-4).2NOTE1—ThistestmethodisrelatedtoTAPPIT432om-82,withwhichitistechnicallyidentical.1.2Thistestmethodisnotintendedforsizedpapersorthosehavinganabsorptiontimeofover120s.SuchpapersshouldbetestedinaccordancewithTestMethodD779orISO535.1.3Forinkabsorptionofblottingpaper,seeTestMethodD2177.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProductD685PracticeforConditioningPaperandPaperProductsforTestingD779TestMethodforWaterResistanceofPaper,Paper-board,andOtherSheetMaterialsbytheDryIndicatorMethodD1193SpecificationforReagentWaterD2177TestMethodforInkAbsorptionofBlottingPaperE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcess2.2ISOStandard:ISO535PaperandBoard—WaterAbsorption(CobbTest)42.3TAPPIStandard:TAPPIT432om-82WaterAbsorbencyofBibulousPapers53.SummaryofTestMethod3.1Ameasureddropofwaterisplacedonthepaperandthetimetodisappearanceoftheshinefromthewetareaisdetermined.4.SignificanceandUse4.1Therateofwaterabsorptionisanextremelyimportantpropertyofmostsanitaryproductssuchaspapertowelingandtissue...
