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Standard Test Method for Mercaptobenzothiazole Sulfenamide Assay by Reduction/ Titration

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Standard Test Method for Mercaptobenzothiazole Sulfenamide Assay by Reduction/Titration


1.1 This test method covers the determination of assay on mercaptobenzothiazole (MBT) sulfenamides. It is based on a titration of the basic amines liberated upon reduction of the sulfenamides with hydrogen sulfide gas (H2S) or 2-mercaptobenzothiazole.

1.2 Any free amine (HNR2) or weak acid salts of the corresponding amine (HX-HNR2) are titrated prior to reduction. This titer is used to calculate percent basic impurity (as free amine) in the sample.

1.3 With the indicated modifications, this test method is applicable to all MBT sulfenamides, that is, N-cyclohexyl-2-benzothiazolesulfenamide (CBS), N,N-diisopropyl-2-benzothiazyl sulfenamide (DIBS), 2 (morpholinothio) benzothiazole (MBS), N,N-dicylohexyl-2-benzothiazyl sulfenamide (DCBS), N-tert-butyl-benzothiazole-sulfenamide (TBBS), and 4-morpholinyl-2-benzothiazyl disulfide (MBSS).

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9.


accelerator; assay; mercaptobenzothiazole; N-cyclohexyl-2-benzothiazole sulfenamide (CBS); N; N-dicyclohexyl2-benzothiazyl sulfenamide (DCBS); N; N-diisopropyl-2benzothiazyl sulfenamide (DIBS); N-tert-butyl-benzothiazole sulfenamide (TBBS); sulfenamide; 2-(morpholinothio) benzothiazole (MBS); 4 morpholinyl-2-benzothiazyl disulfide (MBSS)

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Publication Date

June 10, 1996

Document Type

Test Method

Page Count

9 pages

Committee Number