1.1 本分类系统标准涵盖非刚性氯乙烯聚合物和共聚物类别，其中组合物的树脂部分至少包含90 % 氯乙烯。剩下的10个 % 可包括一种或多种与氯乙烯共聚的单体，或由与聚氯乙烯或其共聚物机械共混的其他树脂组成。 1.2 这些非刚性乙烯基化合物由硬度范围定义，包括必要的稳定剂、增塑剂、填料、染料和颜料，以满足指定要求。 1.3 本分类系统标准包括推荐用于压缩成型、注射成型和挤出的非刚性氯乙烯化合物，但必须认识到，特定化合物不适用于所有这些制造方式。 注1: 本标准与ISO 2898-1和ISO 2898-2的主题相同，但技术内容不同。 1.4 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.5 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。 1.6 本分类系统标准的文本参考了提供解释材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本规范的要求。 1.7 一些应用可以选择包含符合本分类系统标准要求的回收PVC塑料。请参阅适用产品标准“材料和制造”一节中的具体要求。 1.8 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====== 6.1 中提供了选择和识别非刚性氯乙烯化合物的方法 表1 . 本表中列举的特性和定义的测试有望提供所选化合物的识别。由于零件形状、尺寸、负载、环境条件等方面的差异，它们不一定适合直接应用于设计中。只有当按照以下要求模制试样时，它们才适用于设计中 11.1.1 可以预期比较数据吗。所选试验也可用于检验或质量控制，前提是严格按照本文给出的说明和指定方法进行试验，以尽量减少无关变量，并在被检查材料及其检查所用试验的可变性范围内再现结果。

1.1 This classification system standard covers nonrigid vinyl chloride polymer and copolymer classes in which the resin portion of the composition contains at least 90 % vinyl chloride. The remaining 10 % can include one or more monomers copolymerized with vinyl chloride or consist of other resins mechanically blended with polyvinyl chloride or copolymers thereof. 1.2 These nonrigid vinyl compounds are defined by a hardness range and include the necessary stabilizers, plasticizers, fillers, dyes, and pigments to meet the designated requirements. 1.3 This classification system standard includes nonrigid vinyl chloride compounds recommended for compression molding, injection molding, and extrusion, but it must be recognized that particular compounds are not suitable for all these means of fabrication. Note 1: This standard and ISO 2898-1 and ISO 2898-2 address the same subject matter, but differ in technical content. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 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. 1.6 The text of this classification system standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of this specification. 1.7 Some applications have the option to contain recycled PVC plastics that meet the requirements of this classification system standard. Refer to the specific requirements in the Materials and Manufacture section of the applicable product standard. 1.8 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 ====== 6.1 Means for selecting and identifying nonrigid vinyl chloride compounds are provided in Table 1 . The properties enumerated in this table and the tests defined are expected to provide identification of the compounds selected. They are not necessarily suitable for direct application in design because of differences in shape of part, size, loading, environmental conditions, etc. Only when specimens are molded in accordance with 11.1.1 can comparative data be expected. The tests selected can also be used for inspection or quality control provided that they are performed strictly in accordance with the instructions given herein and in the designated methods so that extraneous variables are minimized and results are reproduced within the limits of variability of the material being examined and of the tests used for its examination.