1.1 这些试验方法包括测定乙烯-丙烯-二烯（EPDM）三元共聚物中5-亚乙基降冰片烯（ENB）或双环戊二烯（DCPD）的含量。它们适用于0.1至10质量%范围内的二烯含量。 1.2 ENB和DCPD是乙烯/丙烯橡胶中引入的二烯烃，以产生特定的固化性能。由于二烯含量的高精度测定变得非常重要，因此开发了傅里叶变换红外光谱（FTIR）方法。二烯烃的测定过去是通过折射率技术进行的。 注1: %ENB和%DCPD的程序仅在被量化的红外峰在红外（IR）中的位置不同。 1.3 以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.4 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。 1.5 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。

1.1 These test methods cover the determination of the content of 5-ethylidenenorbornene (ENB) or Dicyclopentadiene (DCPD) in ethylene-propylene-diene (EPDM) terpolymers. They are applicable to diene contents in the 0.1 to 10 mass % range. 1.2 ENB and DCPD are dienes introduced in ethylene/propylene rubbers to generate specific cure properties. Since high precision for diene content determination has become very important, a Fourier Transform Infrared Spectroscopic (FTIR) method was developed. Diene determination was performed in the past by a refractive index technique. Note 1: The procedures for % ENB and % DCPD differ only in the location in the infrared (IR) of the IR peak being quantified. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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.