Designation:D4936−10(Reapproved2015)StandardTestMethodforMercaptobenzothiazoleSulfenamideAssaybyReduction/Titration1ThisstandardisissuedunderthefixeddesignationD4936;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofassayonmercaptobenzothiazole(MBT)sulfenamides.Itisbasedonatitrationofthebasicaminesliberateduponreductionofthesulfenamideswithhydrogensulfidegas(H2S)2,3or2-mercaptobenzothiazole.1.2Anyfreeamine(HNR2)orweakacidsaltsofthecorrespondingamine(HX·HNR2)aretitratedpriortoreduc-tion.Thistiterisusedtocalculatepercentbasicimpurity(asfreeamine)inthesample.1.3Withtheindicatedmodifications,thistestmethodisapplicabletoallMBTsulfenamides,thatis,N-cyclohexyl-2-benzothiazolesulfenamide(CBS),N,N-diisopropyl-2-benzothiazylsulfenamide(DIBS),2(morpholinothio)benzo-thiazole(MBS),N,N-dicylohexyl-2-benzothiazylsulfenamide(DCBS),N-tert-butyl-benzothiazole-sulfenamide(TBBS),and4-morpholinyl-2-benzothiazyldisulfide(MBSS).1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Forspecifichazardstatements,seeSection9.2.ReferencedDocuments2.1ASTMStandards:4D4483PracticeforEvaluatingPrecisionforTestMethodStandardsintheRubberandCarbonBlackManufacturingIndustries3.Terminology3.1DefinitionsofTermsSpecifictoThisStandard:3.1.1IpOH/Tolsolvent,n—titrationsolventcontainingfivevolumesisopropanolandthreevolumestoluene.3.1.2“lot”sample,n—aproductionsamplerepresentativeofastandardproductionunit.3.1.3potassiumhydrogenphthalateacidimetricstandard,n—Fishe...
