Designation:D778–97(Reapproved2007)AnAmericanNationalStandardStandardTestMethodsforHydrogenIonConcentration(pH)ofPaperExtracts(Hot-ExtractionandCold-ExtractionProcedures)1ThisstandardisissuedunderthefixeddesignationD778;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscovertwoproceduresfordetermi-nationofthehydrogenionconcentration,expressedintermsofpH,ofanaqueousextractofpaper.1.2Thesetestmethodsmaybeappliedtowriting,printing,andsizedindustrialpapers.1.3ThesetestmethodsarenotintendedtobeusedfordeterminationofpHofinsulatingpapers,forthatseeTestMethodsD202.1.4Thetestmethodsappearasfollows:SectionTestMethodA—pHofPaper(UnfilteredExtract)AfterExtractionfor1hinCold(2565°C)Water11.1TestMethodB—pHofPaper(UnfilteredExtract)AfterExtractionfor1hinBoilingWater11.21.5SpecificationsmaybebasedonTestMethodAorTestMethodB,orboth.1.6Whereaspecificationorspecificinstructionsoragree-menttouseonlyoneofthesetestmethodsisabsent,determinepHusingbothprocedures,andinterpretresultsbasedonSection12.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D202TestMethodsforSamplingandTestingUntreatedPaperUsedforElectricalInsulationD585PracticeforSamplingandAcceptingaSingleLotofPaper,Paperboard,Fiberboard,andRelatedProductD1193SpecificationforReagentWaterD1293TestMethodsforpHofWaterD1968TerminologyRelatingtoPaperandPaperProductsE70TestMethodforpHofAqueousSolutionsWiththeGlassElectrodeE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcess3.Terminology3.1Definitionsshallbeinaccordanc...
