1.1 该分类体系涵盖聚苯乙烯材料，包括结晶和橡胶改性，适用于成型和挤出。 1.2 该分类系统和随后的线形标注（规范）旨在指出用于制造成品或零件的塑料材料。它不用于选择材料。在仔细考虑零件所需的设计和性能、其将暴露的环境、将采用的制造工艺、除本规范涵盖的材料外的材料的固有特性和经济性后，可由在塑料领域具有专业知识的人员进行材料选择。 1.3 本规范中包含的特性是识别所涵盖成分所需的特性。使用第节中给出的后缀指定识别对专业应用重要的特定特征所需的其他要求 5. . 1.4 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。 注1: 本标准结合了ISO 1622-1-2和ISO 2897-1-2中的元素，但不等同于任何一个ISO标准。 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 classification system covers polystyrene materials, both crystal and rubber modified, suitable for molding and extrusion. 1.2 This classification system and subsequent line callout (specification) are intended to be a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastics field after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the inherent properties of the material other than those covered by this specification, and the economics. 1.3 The properties included in this specification are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are to be specified using the suffixes as given in Section 5 . 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. Note 1: This standard combines elements from ISO 1622-1-2 and ISO 2897-1-2, but is not equivalent to either ISO standard. 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.