1.1 本试验方法适用于测定氢化丁腈橡胶中不饱和度（碘值）的Wiijs程序。 1.2 本试验方法仅适用于由丙烯腈和丁二烯共聚物衍生的氢化丁腈橡胶。 1.3 碘值以每克HNBR的碘厘米数[cg（I 2. )/g] 。碘值越高表示不饱和度越高。 1.4 如果已经测定了氢化前基础聚合物的碘值，则该试验方法适用于计算氢化丁腈橡胶的残余不饱和度百分比。 1.5 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.6 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。 1.7 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====== 4.1 氢化丁腈橡胶具有不同的不饱和度和不同的丙烯腈含量。高饱和等级具有最佳的抗老化性能，如暴露在高温、臭氧和化学品中，并且只有使用过氧化物或高能辐射才能有效固化。 4.2 除了过氧化物和高能辐射外，部分不饱和等级还可以通过硫系统固化。 4.3 该试验方法提供了一种测定未硫化状态下氢化丁腈橡胶不饱和度的技术。它可以用于研发、质量控制和裁判目的。

1.1 This test method covers the Wiijs procedure for the determination of unsaturation (iodine value) in hydrogenated nitrile rubbers. 1.2 This test method is applicable only to those hydrogenated nitrile rubbers derived from copolymers of acrylonitrile and butadiene. 1.3 Iodine values are reported in centigrams of iodine per gram of HNBR [cg(I 2 )/g]. Higher iodine values indicate higher levels of unsaturation. 1.4 This test method is appropriate for calculating the percent residual unsaturation of hydrogenated nitrile rubber if the iodine value of the base polymer before hydrogenation has been determined. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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. 1.7 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 Hydrogenated nitrile rubbers are available at different levels of unsaturation and different acrylonitrile content. Highly saturated grades offer optimum resistance to aging, such as exposure to heat, ozone and chemicals, and can be cured effectively only with peroxides or high energy radiation. 4.2 Partially unsaturated grades can be cured by sulfur systems in addition to peroxides and high energy radiation. 4.3 This test method provides a technique to determine the unsaturation level of hydrogenated nitrile rubbers in the raw, unvulcanized state. It can be used for research and development, quality control, and referee purposes.