ASTM D4936-96(2001)
Historical Standard: ASTM D4936-96(2001) Standard Test Method for Mercaptobenzothiazole Sulfenamide Assay by Reduction/ Titration
SUPERSEDED (see Active link, below)
ASTM D4936
1. Scope
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 (H 2 S) or 2-mercaptobenzothiazole.
1.2 Any free amine (HNR 2 ) or weak acid salts of the corresponding amine (HX-HNR 2 ) 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D4483 Practice for Evaluating Precision for Test Method Standards in the Rubber and Carbon Black Manufacturing Industries
Keywords
accelerator; assay; mercaptobenzothiazole; N-cyclohexyl-2-benzothiazole sulfenamide (CBS); N-dicyclohexyl2-benzothiazyl sulfenamide (DCBS); N-diisopropyl-2benzothiazyl sulfenamide (DIBS); N-tert-butyl-benzothiazole sulfenamide (TBBS); sulfenamide; 2-(morpholinothio) benzothiazole (MBS); 4 morpholinyl-2-benzothiazyl disulfide (MBSS); Assay; Mercaptobenzothiazole sulfenamide (MBTS); Purity analysis--rubber materials; Rubber compounding materials; Sulfenamide accelerator; Titration; Vulcanization accelerators;
ICS Code
ICS Number Code 71.080.30 (Organic nitrogen compounds)
DOI: 10.1520/D4936-96R01
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