Designation:D1696−95(Reapproved2011)StandardTestMethodforSolubilityofCelluloseinSodiumHydroxide1ThisstandardisissuedunderthefixeddesignationD1696;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethod2isintendedforapplicationtodissolving-typecellulosepulpspreparedfromcottonorwood.Theprocedureisnotdirectlyapplicabletounrefinedpulpsforuseinchemicalconversionprocessesbecausesolubilityequi-libriummaynotbeattainedwithinthespecifiedextractiontime.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoconsultandestablishappropriatesafetyandhealthpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:3D1193SpecificationforReagentWaterD1347TestMethodsforMethylcellulose(Withdrawn2003)4D1348TestMethodsforMoistureinCellulose2.2TAPPIStandard:T429MethodforAlpha-CelluloseinPaper53.SummaryofTestMethod3.1Pulpissteepedinasodiumhydroxidesolutionofaspecifiedconcentrationfor1hat20°C.Thesolublefractionisestimatedbydichromateoxidationofthefilteredsteepingalkali.Theconcentrationofsodiumhydroxideusedinthepulpextractionprocessmustbereportedaspartoftheanalyticalresult.Sodiumhydroxideconcentrationsof10,18,and21.5%aremostfrequentlyused.Dataarereportedaspercentofdrysampleweight.3.2Theextractionprocedureavoidsdilutionsequences,andtherefore,theresultsarenotcomparabletodataobtainedbythealpha,beta,gammamethodsofpulpfractionation(seeTAPPIMethodT429).Theterms“alpha-,”“beta-,”or“gamma-”cellulosemustnotbeappliedtoanytestvaluesobtainedbythisproceduresincetheyaredefinedonlybythemethodoftheirdetermination.3.3Theessentialfeatureofthemethodi...
