1.1 本试验方法测定甲苯-2,4-二异氰酸酯、甲苯-2,6-二异氰酸酯或两者混合物的可水解氯含量。可将本试验方法应用于具有适当溶解度的其他异氰酸酯。（参见 注1 .) 异氰酸酯中可水解氯的主要来源是氨甲酰氯和溶解的光气。这两种化合物都与醇和水反应，形成脲、氨基甲酸酯、二氧化碳和盐酸。（参见 注释2 .) 1.2 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。 注1: 本试验方法可能适用于粗聚合物异氰酸酯。 然而，尚未确定粗聚合物异氰酸酯的精度。 注2: 本标准与ISO 15028相同。 1.3 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====== 5.1 该试验方法可用于研究或质量控制，以表征甲苯二异氰酸酯。在某些聚氨酯系统中，可水解氯与性能相关。

1.1 This test method determines the hydrolyzable chlorine content of toluene-2,4-diisocyanate, toluene-2,6-diisocyanate, or mixtures of the two. It is acceptable to apply this test method to other isocyanates of suitable solubility. (See Note 1 .) The main sources of hydrolyzable chlorine in the isocyanates are carbamoyl chloride and dissolved phosgene. Both of these compounds react with alcohols and water, forming ureas, carbamates, carbon dioxide, and hydrochloric acid. (See Note 2 .) 1.2 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. Note 1: It is possible that this test method is applicable to crude polymeric isocyanates. However, the precision with crude polymeric isocyanates has not been established. Note 2: This standard is identical to ISO 15028. 1.3 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 ====== 5.1 This test method can be used for research or for quality control to characterize toluene diisocyanates. Hydrolyzable chlorine correlates with performance in some polyurethane systems.