1.1 此测试方法用于确定25 聚丙烯均聚物和共聚物的°C二甲苯可溶部分。 1.2 本标准并不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。 注1: 该测试方法在技术上等同于ISO 16152. 1.3 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====== 5.1 该试验的结果提供了聚丙烯均聚物和共聚物的总可溶性部分的相对测量。可溶性组分与聚丙烯中的无定形组分近似相关。二甲苯被广泛用于测定聚丙烯中的可溶性组分，因为它比其他溶剂对无规组分更具特异性。已发现用特定溶剂获得的可溶性组分的浓度与产品在某些应用（例如薄膜和纤维）中的性能特性密切相关。通过一种溶剂和在一个沉淀时间获得的数据不能分别与通过另一种溶剂或沉淀时间得到的数据进行比较。

1.1 This test method is to be used for determining the 25 °C xylene-soluble fraction of polypropylene homopolymers and copolymers. 1.2 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. Note 1: This test method is technically equivalent to ISO 16152. 1.3 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 ====== 5.1 The results of this test provide a relative measure of the total soluble fraction of polypropylene homopolymers and copolymers. The soluble fraction approximately correlates to the amorphous fraction in the polypropylene. Xylene is widely used for determining the soluble fraction in polypropylene as it is more specific to the atactic fraction than other solvents. The concentration of a soluble fraction obtained with a specific solvent has been found to relate closely to the performance characteristics of a product in certain applications, for example film and fiber. Data obtained by one solvent and at one precipitation time cannot be compared with data obtained by another solvent or precipitation time, respectively.