1.1 本试验方法涵盖苯并噻唑二硫化物（MBTS）含量的测定。它基于在酸性介质中用碘化钾（KI）滴定MBT还原时释放的游离碘。 1.2 测定以质量百分比确定。 1.3 未测定游离2-巯基苯并噻唑（MBT）含量。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 该试验方法旨在评估用于加速橡胶和乳胶硫化的MBT的纯度。MBT的数量对于预测橡胶化合物的性能以及原料采购和控制具有重要意义。 4.2 该测试方法可作为质量控制工具，用于研究和开发工作。

1.1 This test method covers the determination of assay of benzothiazyl disulfide (MBTS). It is based on a titration of free iodine liberated upon reduction of MBTS, with potassium iodide (KI) in acid medium. 1.2 The assay is determined as mass percent. 1.3 Free 2-mercaptobenzothiazole (MBT) content is not determined. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 The test method is designed to assess the purity of MBTS, which is used for rubber and latex vulcanization acceleration. The amount of MBTS is of importance in predicting performance in rubber compounds and for raw material purchase and control. 4.2 This test method may be used as a quality control tool and for research and development work.