1.1 这些试验方法测量甲苯二异氰酸酯（TDI）2,4-和2,6-异构体混合物中甲苯-2,6-二异氰酸酯（2,6-TDI）异构体或甲苯-2,4-二异氰酸酯异构体（2,4-TDI）的量。提供了两种不同的测试方法，以在可能的广泛异构体浓度范围内给出准确的结果。 1.1.1 测试方法A- 适用于含5-95的TDI样品 % 2,6-二异氰酸酯异构体（5至95 % 2,4-TDI异构体）。 1.1.2 测试方法B- 适用于含0至5的TDI样品 % 2,6-二异氰酸酯异构体（95至100 % 2,4-TDI异构体）。 注1: 这些测试方法相当于ISO 15064. 1.2 以国际单位制表示的数值应视为标准。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 这些试验方法适用于测定甲苯二异氰酸酯异构体含量的研究或质量控制。 5.2 甲苯二异氰酸酯的异构体含量与其反应性有关。

1.1 These test methods measure the amount of toluene-2,6-diisocyanate (2,6-TDI) isomer or toluene–2,4–diisocyanate (2,4-TDI) isomer in mixtures of the 2,4- and 2,6-isomers of toluenediisocyanate (TDI). Two different test methods are provided to give accurate results over the broad range of isomer concentrations possible. 1.1.1 Test Method A— Applicable to TDI samples containing 5 to 95 % of 2,6-TDI isomer (5 to 95 % 2,4-TDI isomer). 1.1.2 Test Method B— Applicable to TDI samples containing 0 to 5 % of 2,6-TDI isomer (95 to 100 % 2,4-TDI isomer). Note 1: These test methods are equivalent to ISO 15064. 1.2 The values stated in SI units are to be regarded as standard. 1.3 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. 1.4 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 These test methods are suitable for research or for quality control to determine the isomer content of toluene diisocyanates. 5.2 The isomer content of a toluene diisocyanate relates to its reactivity.