Designation:D2810−13StandardTestMethodforpHofLeather1ThisstandardisissuedunderthefixeddesignationD2810;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1ThistestmethodcoversthedeterminationofthepHofalltypesofleather.Thismethoddoesnotapplytowetblue.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D2813PracticeforSamplingLeatherforPhysicalandChemicalTests3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1ThepHofasolutionhasbeendefinedasthenegativelogarithmofthehydrogenionactivity.AsolutionofpH7isneutralat24°C.Lowernumbersindicateincreasingacidity;highernumbers,increasingalkalinity.4.SignificanceandUse4.1ThistestmethodisdesignedtomeasurethepHofadistilled-waterextractofleather.Thisisconsideredtobeameasureoftheacidityoralkalinityoftheleather.Excessiveacidityoralkalinitymayhaveadeleteriouseffectontheagingcharacteristicsofleather.4.2Thistestmethodissuitablefordevelopment,control,andserviceevaluationofleather.5.Interferences5.1Iftheleathercontainsanexcessiveamountoffatsorgreasesorhasbeentreatedwithamaterialtoobtainwaterrepellency,thewettabilityandconsequentlytheextractabilitymaybeaffected.5.2Ifthespecimenisdifficultorimpossibletowet,itmaybetreatedbyanyofthefollowingprocedures:5.2.1Avacuummaybeusedtoeffectwetting.5.2.2Mixwiththerequiredamountofwaterfor1mininadisintegrator.25.2.3ExtracttheweighedspecimenwithafatsolventinaSoxhletapparatusfor5h.Allowthes...
