Designation:D4655−95(Reapproved2017)StandardTestMethodsforSulfatesinLeather(Total,Neutral,andCombinedAcid)1ThisstandardisissuedunderthefixeddesignationD4655;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodsareintendedforuseindeterminingthetotal,neutral,andcombinedacidsulfateinmineral-tannedleather.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D2813PracticeforSamplingLeatherforPhysicalandChemicalTestsD4654TestMethodforSulfateBasicityinLeather3.SignificanceandUse3.1ThesetestmethodsareusedtodeterminethebasicityofleatherwhenusedinaccordancewithTestMethodD4654.4.Apparatus4.1VolumetricFlask,250mL.4.2Filterpaper,ashless,finegrainedandporcelaincrucible.4.3Crucible,Gooch,withporousporcelainfilter(optional).5.Reagents5.1AmmoniumHydroxideSolution,(0.1N)—7mL/Lre-agentgradeconcentrateNH4OH.Optional:Potassiumdihydro-genphosphate,0.1molarsolution(13.6g/LKH2PO4)orsodiumdihydrogenphosphate,0.1molarsolution(13.8g/LNaH2PO4-H2O).5.2HydrochloricAcidSolution,(1.5N)—125mL/Lreagentgradeconcentratehydrochloricacid.5.3BariumChlorideSolution—(BaCl2·2H2O),1%.5.4SodiumHydrox...
