Designation:D779–03AnAmericanNationalStandardStandardTestMethodforWaterResistanceofPaper,Paperboard,andOtherSheetMaterialsbytheDryIndicatorMethod1ThisstandardisissuedunderthefixeddesignationD779;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofthetimerequiredforwatertopassthroughaspecimenofpaper.Itisbasedonthedry-indicatormethodofCarson(1-4)2andmodificationsofitdevelopedbyAbrams(5)andCodwise(6-8).1.2Itisdesignedforusewithmaterialsthatrequirearelativelyshorttimetotest(uptoapproximately30s),andhasbeenfoundusefulintestingslack-sizedpapers.NOTE1—Fortestinghard-sizedpaperandpaperboard,seeTAPPITestMethodT441.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProduct3D685PracticeforConditioningPaperandPaperProductsforTesting3E122PracticeforCalculatingSampleSizetoEstimate,withaSpecifiedTolerableError,theAverageforaChar-acteristicofaLotorProcess42.2TAPPIStandards:T441Waterabsorptivenessofsized(non-bibulous)paperandpaperboard(Cobbtest)5T433Waterresistanceofsizedpaperandpaperboard(dryindicatormethod)53.SummaryofTestMethod3.1Thistestmethodconsistsofbringingonesideofthetestspecimenincontactwithwaterandfindingthetimerequiredforthewatertopassthroughthespecimen,asindicatedbythedevelopmentofcolorinanindicatorpowderconsistingofamixtureofwater-solubledye,sugar,andstarch.Thesugarservesthetwo-foldpurposeofmaskingthecoloroftheparticlesofdyeaslongastheyaredry...
