1.1 本规范涵盖了对原始粉末形式的氯乙烯均聚物的要求的制定，这些均聚物用于随后在热塑性组合物中的混合和加工。这些树脂的标称比重为1.4，理论氯含量为56.8 %. 1.2 已经认识到两种类型的树脂:通用型（悬浮或质量）和分散型。当与增塑剂混合时，通用树脂产生干燥或潮湿的粉末，而分散树脂产生液体浆料。由于许多树脂聚合以满足特殊要求，因此提供了一个分类系统，允许广泛选择等级。 1.3 以国际单位制表示的数值应视为标准。 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。 注1: 本标准和ISO 1264 – 1980年讨论的主题相同，但技术内容不同。 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 This specification covers the establishment of requirements for homopolymers of vinyl chloride in original powder form intended for subsequent mixing and processing in thermoplastic compositions. These resins have a nominal specific gravity of 1.4 and a theoretical chlorine content of 56.8 %. 1.2 Two types of resin have been recognized: general purpose (suspension or mass) and dispersion. When mixed with plasticizer, general-purpose resins yield a dry or moist powder while dispersion resins yield a liquid slurry. Since many resins are polymerized to meet special requirements, a system of classification has been provided that permits a wide choice of grades. 1.3 The values stated in SI units are to be regarded as the 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. Note 1: This standard and ISO 1264 – 1980 address the same subject matter, but differ in technical content. 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.