Designation:D1696−95(Reapproved2019)´1StandardTestMethodforSolubilityofCelluloseinSodiumHydroxide1ThisstandardisissuedunderthefixeddesignationD1696;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Section2.1wasupdatedEditoriallyinDecember2019.1.Scope1.1Thistestmethod2isintendedforapplicationtodissolving-typecellulosepulpspreparedfromcottonorwood.Theprocedureisnotdirectlyapplicabletounrefinedpulpsforuseinchemicalconversionprocessesbecausesolubilityequi-libriummaynotbeattainedwithinthespecifiedextractiontime.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD1347TestMethodsforMethylcellulose(Withdrawn2003)4D1348TestMethodsforMoistureinCellulose(Withdrawn2017)42.2TAPPIStandard:T429MethodforAlpha-CelluloseinPaper53.SummaryofTestMethod3.1Pulpissteepedinasodiumhydroxidesolutionofaspecifiedconcentrationfor1hat20°C.Thesolublefractionisestimatedbydichromateoxidationofthefilteredsteepingalkali.Theconcentrationofsodiumhydroxideusedinthepulpextractionprocessmustbereportedaspartoftheanalyticalresult.Sodiumhydroxideconcentrationsof10,18,and21.5%aremostfrequentlyused.Dataarereportedaspercentofdrysampleweigh...
