1.1 这些试验方法（A和B）确定原油或改性原油的粘度 iso 氰酸盐。适用于甲苯二异氰酸酯衍生产品 iso 氰酸盐、亚甲基二（苯基异氰酸酯）和聚合物（亚甲基苯基异氰酸酯）（见 注1 ). 注1: 试验方法A包括使用旋转仪器测量动态粘度的程序。试验方法B是异氰酸酯运动粘度的一般程序。 1.2 以国际单位制表示的数值应视为标准值。 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。 有关具体危险声明，请参阅 警告 在…的结尾 5.1 . 注2: 试验方法A等同于ISO 3219，试验方法B等同于ISO 3104。 1.4 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 这些测试方法可用于研究、质量控制或规格测试，以表征 iso 聚氨酯产品中使用的氰酸盐。 4.2 粘度测量流体在没有湍流或其他力的情况下对均匀连续流动的阻力。 4.3 某些异氰酸酯在某些条件下表现出非牛顿行为。尽可能在相同条件下生成结果进行比较，即旋转粘度的相同主轴/速度组合和运动粘度的相同管尺寸。

1.1 These test methods (A and B) determine the viscosity of crude or modified iso cyanates. They are applicable to products derived from toluene di iso cyanate, methylene di(phenylisocyanate), and polymeric (methylene phenylisocyanate) (see Note 1 ). Note 1: Test method A includes a procedure for measuring dynamic viscosity using a rotational instrument. Test method B is a general procedure for kinematic viscosity of isocyanate. 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. For specific hazards statement, see Warning at the end of 5.1 . Note 2: Test Method A is equivalent to ISO 3219, Test Method B is equivalent to ISO 3104. 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 ====== 4.1 These test methods can be used for research, quality control, or specification tests to characterize iso cyanates used in polyurethane products. 4.2 Viscosity measures the resistance of a fluid to uniform continuous flow without turbulence or other forces. 4.3 Some isocyanates exhibit non-Newtonian behavior under certain conditions. Whenever possible, generate results for comparison under the same conditions, that is, the same spindle/speed combination for rotational viscosity and the same tube size for kinematic viscosity.