Designation:D6020−00(Reapproved2010)StandardPracticeforCalculationof(Non-Mineral)CombinedTanningAgentsandDegreeofTannage1ThisstandardisissuedunderthefixeddesignationD6020;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thispracticecoversthedeterminationofthecombinedtanninandnonextractableorganicresinsandthedegreeoftannageofalltypesofvegetable-tannedleatherandleatherwithorganicretannages.Thispracticedoesnotapplytowetblue.2.ReferencedDocuments2.1ASTMStandards:2D2868TestMethodforNitrogenContent(Kjeldahl)andHideSubstanceContentofLeather,WetBlueandWetWhiteD2875TestMethodforInsolubleAshofVegetable-TannedLeatherD2876TestMethodforWater-SolubleMatterofVegetable-TannedLeatherD3495TestMethodforHexaneExtractionofLeather3.SignificanceandUse3.1Thispracticemaybeusedtodeterminenon-proteinornon-nitrogencontainingorganicmatterinleatherwhichisnotextractablewithwaterorhexane.Exampleswouldbeveg-etabletanninsandacryliclubricants.4.Procedure4.1ThechloroformandwaterextractablematerialsandinsolubleashinthespecimenfortestshallbedeterminedinaccordancewithTestMethodsD2875,D2876,andD3495.4.2ThehidesubstanceinthespecimenfortestshallbedeterminedinaccordancewithTestMethodD2868.5.CalculationofResults5.1Thepercentageofcombinedtannininthespecimenshallbecalculatedasfollows:Combinedtannin,percent51002~A1B1C1D!(1)where:A=percentofchloroform-solublematerial(mfb),B=percentofwater-solublematerial(mfb),C=percentofinsolubleash(mfb),andD=percentofhidesubstance(mfb).(mfb)=moisturefreebasis.5.2Thedegreeoftannageshallbecalculatedasfollows:Degreeoftannage5TD3100(2)where:T=percentofcombinedtannin,andD=percentofhidesubstance.6.Report6.1Thecombinedtannininthespecimenshallbereportedtothenearest0.1%.6.2Thedegreeoftannageinthespecime...
