Designation:D2875−00(Reapproved2010)StandardTestMethodforInsolubleAshofVegetable-TannedLeather1ThisstandardisissuedunderthefixeddesignationD2875;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthein-solubleashinalltypesofvegetable-tannedleathers.Thistestmethoddoesnotapplytowetblue.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2617TestMethodforTotalAshinLeatherD2876TestMethodforWater-SolubleMatterofVegetable-TannedLeather3.SummaryofTestMethod3.1Thespecimenfromwhichthewater-solublematterhasbeenremovedisheatedat600625°Cuntilcarbonisremovedandconstantweightisattained.Theweighedresidualmatteristermed“insolubleash”andiscalculatedaspercentageoftheoriginalsample.4.SignificanceandUse4.1ThistestmethodgivestheamountofashremaininginthespecimenafterwaterextractiontoremovewatersolublesfromtheleatherinaccordancewithTestMethodD2876.Theinsolubleashisusedincalculatingthecombinedtanninbecauseitispartofthetannedfiberstructurethatdoesnotleachfromtheleatherduringwaterextraction.5.Apparatus5.1Crucible,porcelainorplatinum,largeenoughtoholdtheleatherspecimen.5.2ElectricMuffleFurnace,withtemperaturecontrollerandpyrometer,capableofmaintainingatemperatureof600625°C.6.TestSpecimen6.1Thespecimenshallconsistofthe5-gleathersampleremainingafterwaterextractionasdirectedinTestMethodD2876.Anydeviationfromthissamplesizeshouldbeincludedwiththeanalyticalresults.7.Procedure7.1Removethespecimenquantitativelyfromt...
