1.1 这些试验方法包括测定乙烯-丙烯共聚物（EPM）和乙烯-丙二烯三元共聚物（EPDM）中乙烯和丙烯单元在35至85质量范围内的比例 % 乙烯。需要四种测试方法来涵盖各种商业聚合物，其中包含干扰各种红外峰的添加剂或聚合二烯单元。除非存在干扰，否则所有四种试验方法都应给出类似的结果。试验方法按以下顺序出现: 1.1.1 压膜试验方法: 小节 试验方法A -对于质量在35到70之间的三元乙丙橡胶和三元乙丙橡胶 % 乙烯 9 – 14 试验方法B -对于质量在60到85之间的三元乙丙橡胶和三元乙丙橡胶 % 乙烯，乙烯/丙烯/1,4-己二烯三元共聚物除外 15 – 19 试验方法C -对于质量在35到85之间的所有三元乙丙橡胶和三元乙丙橡胶聚合物 % 乙烯，使用近红外 20 – 24 1.1.2 流延膜试验方法: 试验方法D -对于质量在35到85之间的所有三元乙丙橡胶和三元乙丙橡胶聚合物 % 乙烯，乙烯/丙烯/1,4-己二烯三元共聚物除外 25 – 32 1.2 这些试验方法不适用于充油三元乙丙橡胶，除非根据试验方法D首先除去油。 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。 ====意义和用途====== 4.1 这些测试方法可用于确定测试方法中不同化合物中评估的EPDM聚合物 D3568 . 4.2 乙烯序列分布的差异导致在相同乙烯含量下结晶度和生坯强度的差异。由于这些是三元乙丙橡胶和三元乙丙橡胶加工性能和最终使用性能的重要变量，因此橡胶的乙烯含量不应作为确定特定橡胶是否适合预期用途的唯一测量值。

1.1 These test methods cover the determination of the proportion of ethylene and propylene units in ethylene-propylene copolymers (EPM) and ethylene-propylenediene terpolymers (EPDM) over the range from 35 to 85 mass % ethylene. Four test methods are needed to encompass the variety of commercial polymers that contain additives or polymerized diene units that interfere with the various infrared peaks. Except when interferences are present, all four test methods should give similar results. The test methods appear in the following order: 1.1.1 Pressed Film Test Methods: Sections Test Method A —For EPM and EPDM between 35 and 70 mass % ethylene 9 – 14 Test Method B —For EPM and EPDM between 60 and 85 mass % ethylene, except for ethylene/propylene/1,4-hexadiene terpolymers 15 – 19 Test Method C —For all EPM and EPDM polymers between 35 and 85 mass % ethylene, using near infrared 20 – 24 1.1.2 Cast Film Test Methods: Test Method D —For all EPM and EPDM polymers between 35 and 85 mass % ethylene, except for ethylene/propylene/1,4-hexadiene terpolymers 25 – 32 1.2 These test methods are not applicable to oil-extended EPDM unless the oil is first removed in accordance with Test Method D. 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. ====== Significance And Use ====== 4.1 These test methods can be used for determining which EPDM polymers are evaluated in the different compounds in Test Methods D3568 . 4.2 Differences in ethylene sequence distribution cause differences in crystallinity and green strength at the same ethylene content. Since these are important variables in EPM and EPDM processability and end-use properties, the ethylene content of the rubber should not be used as the sole measurement to determine the suitability of a particular rubber for an intended purpose.