Designation:D6408−99(Reapproved2020)StandardTestMethodforAnalysisofTanneryLiquors1ThisstandardisissuedunderthefixeddesignationD6408;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheanalysisoftanneryliquorsmadeupfromvegetabletanningmaterials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4903TestMethodforTotalSolidsandWaterinVegetableTanningMaterialExtractsD4904PracticeforCoolingofAnalyticalSolutionsD6401TestMethodforDeterminingNon-TanninsandTan-nininExtractsofVegetableTanningMaterialsD6402TestMethodforDeterminingSolubleSolidsandInsolublesinExtractsofVegetableTanningMaterialsD6404PracticeforSamplingVegetableMaterialsContain-ingTanninD6410TestMethodforDeterminingAcidityofVegetableTanningLiquors2.2ALCAMethods:A25AnalysisofTanneryLiquors33.Terminology3.1Definitions:3.1.1tanneryliquor—watersolutionscontainingvegetabletanninthataremadeupandusedinavegetabletannery.3.1.2tannin—anastringentsubstancefoundinthevariouspartsofplantssuchasbark,wood,leaves,nuts,fruits,roots,etc.Also,quantitatively,tanninsareoperationallydefinedasthenon-volatilematerialspresentintanninextractsandraworspentmaterialsthataredissolve...
