Designation:D6410−99(Reapproved2020)StandardTestMethodforDeterminingAcidityofVegetableTanningLiquors1ThisstandardisissuedunderthefixeddesignationD6410;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversdeterminingtheacidityoftanneryliquorsmadeupfromvegetabletanningmaterials.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4904PracticeforCoolingofAnalyticalSolutionsD6404PracticeforSamplingVegetableMaterialsContain-ingTannin2.2ALCAMethods:A25AnalysisofTanneryLiquors33.Terminology3.1Definitions:3.1.1tanneryliquor—watersolutionscontainingvegetabletanninthataremadeupandusedinavegetabletannery.4.SummaryofTestMethod4.1Ananalyticalsolutionispreparedfromthesampleoftanneryliquor(PracticeD6404).Specimenaliquotsfromthisanalyticalsolutionarethenanalyzedfortotalaciditybyoneoftwotitrametricmethods.5.SignificanceandUse5.1Thistestmethodisusedtodetermineoneofthechemicalpropertiesoftanneryliquorswhicharerelevantforthevegetabletanningprocessandinfluencetheastringencyofvegetabletanningliquors.Theastringencyofliquorsisdepen-dentuponthesolidsandtannincontentandtheacidity.Thistestmethodprovidesastandardprocedurefordeterminingthe...
