Designation:D4654−87(Reapproved2020)StandardTestMethodforSulfateBasicityinLeather1ThisstandardisissuedunderthefixeddesignationD4654;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisintendedforuseincalculatingthesulfatebasicityofmineraltannedleather.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.3Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2807TestMethodforChromicOxideinLeather(Perchlo-ricAcidOxidation)D4655TestMethodsforSulfatesinLeather(Total,Neutral,andCombinedAcid)3.SignificanceandUse3.1Thistestmethodisusedtodeterminethepercentoftotalchromicoxidethatiscombinedwithhydroxylandmayserveasameasureofchromefixation.4.ApparatusandReagents4.1TheapparatusandreagentsshallbeasdescribedinTestMethodsD2807andD4655.5.Sampling,TestSpecimensandTestUnits5.1ThetestspecimenshallbeasdescribedinTestMethodsD2807andD4655.5.2Unlessotherwisespecifiedinthedetailspecifications,twospecimensfromthecompositesampleshallbetested.5.3Thepercentbasicityofthesamplefortestshallbetheaverageofthetestresultsobtainedfromthespecimenstested.6.Procedure6.1ThechromicoxideshallbedeterminedasdescribedinTestMethodD2807.ThecombinedsulfateshallbedeterminedasdescribedinMethodD4655.7.CalculationofResults7.1ExpressthepercentbasicityofthespecimenaccordingtoSchorlemmer’ssystem.Inthissystem,thepercentbasi...
