1.1 本试验方法涵盖氢化丁腈橡胶中残余不饱和度（未氢化丁二烯中的双键）的百分比，并基于溶液浇铸橡胶膜的红外检测。 1.2 本试验方法适用于所有级别的未加工状态的氢化丁腈橡胶。 1.3 本试验方法假设试样和红外光谱由经验丰富的人员制备和分析，并且设备按照制造商的指示进行操作以获得最佳性能。本试验方法不包括红外分光光度计的操作细节。 1.4 由于在红外分光光度法中通常使用波数（cm −1 )在整个测试方法中，使用的不是国际单位制中的频率单位赫兹（Hz），而是前者。 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，并且只能通过过氧化物或高能辐射进行有效固化。 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红外技术来测定原料状态下氢化丁腈橡胶的不饱和度。它可以用于研发、质量控制和裁判目的。

1.1 This test method covers the percentage of residual unsaturation (double bonds in unhydrogenated butadiene) in hydrogenated nitrile rubber and is based on infrared examination of rubber films cast from solution. 1.2 This test method is applicable to all grades of hydrogenated nitrile rubber in the raw state. 1.3 This test method assumes that specimens and infrared spectra are prepared and analyzed by experienced personnel and that the equipment is operated according to the manufacturer's direction for optimum performance. No details for operation of infrared spectrophotometers are included in this test method. 1.4 Since it is customary in infrared spectrophotometry to use wavenumbers (cm −1 ) rather than Hertz (Hz), the unit for frequency in the SI system, the former is employed throughout this test method. 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 effectively cured 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 an infrared technique to determine the unsaturation level of hydrogenated nitrile rubbers in the raw state. It can be used for research and development, quality control, and referee purposes.