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ASTM D4936-10(2015)

Historical Reaffirmation

Standard Test Method for Mercaptobenzothiazole Sulfenamide Assay by Reduction/Titration

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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)2 ,3 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.


5.1 This test method is designed to assess the purity of 2-mercaptobenzothiazole sulfenamide accelerators. These products are used in combination with sulfur for the vulcanization of rubber.

5.2 The test method is suitable for assessing product specifications in that the property it measures is related to product performance. Since it is the primary property for comparison of product quality at different production facilities, good interlaboratory accuracy and precision is required.

5.3 Based on past experience, two significant sources of error in this test method are: (1) incomplete reduction and (2) titration end point assessment. Problems in these areas can be avoided by closely following the procedure.

SDO ASTM: ASTM International
Document Number D4936
Publication Date June 1, 2015
Language en - English
Page Count 8
Revision Level 10(2015)
Supercedes
Committee D11.11
Publish Date Document Id Type View
Dec. 1, 2010 D4936-10 Revision
Oct. 1, 2005 D4936-05 Revision
June 10, 1996 D4936-96 Revision
Sept. 1, 2023 D4936-10R23 Reaffirmation
Dec. 1, 2019 D4936-10R19 Reaffirmation
June 1, 2015 D4936-10R15 Reaffirmation
June 10, 1996 D4936-96R01 Reaffirmation