1.1 本试验方法涵盖SBR橡胶和苯乙烯增强胶乳中长聚苯乙烯块的测定。 1.2 嵌段苯乙烯含量百分比可在1至100范围内测定 %. 1.3 本试验方法旨在用于无凝胶聚合物，但如果已证明凝胶不会干扰，则可用于含有凝胶的聚合物。 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。 有关具体的危险说明，请参阅第节 7. . 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 该测试方法适用于制造控制、开发和研究。

1.1 This test method covers the determination of long polystyrene blocks in SBR rubbers and styrene-reinforced latices. 1.2 Percent block styrene content may be determined in the range from 1 to 100 %. 1.3 This test method is intended for use on gel-free polymers, but it may be used on polymers containing gel, if it has been proven that gel does not interfere. 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. For specific hazard statements, see Section 7 . 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 This test method is suitable for manufacturing control, development, and research studies.