本文件建立了聚苯乙烯热塑性材料的命名体系，可作为规范的基础。 聚苯乙烯塑料的类型通过基于适当等级的指定性能的分类系统相互区分: a） 维卡软化温度，以及 b） 熔体质量流动速率。 以及关于预期用途和/或加工方法、重要性能、添加剂和着色剂、填料和增强材料的信息。 本文件适用于所有无定形聚苯乙烯均聚物。适用于正常使用的材料，未经改性或经着色剂、添加剂、填料等改性的材料。 本文件不适用于发泡聚苯乙烯、苯乙烯共聚物、取代苯乙烯均聚物或用其他聚合物（如弹性体）改性的均聚物。 这并不意味着具有相同名称的材料必然具有相同的性能。本文件不提供工程数据、性能数据或加工条件数据，这些数据可能需要用于指定特定应用和/或加工方法的材料。 如果需要此类附加性能，则应根据ISO 24022-2规定的试验方法（如适用）进行测定。 为了为特定应用指定热塑性材料或确保可重复加工，可在数据块5中给出附加要求（见4）。 6).

This document establishes a system of designation for polystyrene thermoplastic material, which can be used as the basis for specifications. The types of polystyrene plastics are differentiated from each other by a classification system based on appropriate levels of the designatory properties: a) Vicat softening temperature, and b) melt mass-flow rate. and on information about the intended application and/or method of processing, important properties, additives and colorants, fillers and reinforcing materials. This document is applicable to all amorphous polystyrene homopolymers. It applies to materials ready for normal use, unmodified or modified by colorants, additives, fillers, etc. This document does not apply to expanded polystyrene, styrene copolymers, homopolymers of substituted styrene or those modified with other polymers such as elastomers. It is not intended to imply that materials having the same designation give necessarily the same performance. This document does not provide engineering data, performance data or data on processing conditions which might be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they are determined in accordance with the test methods specified in ISO 24022-2, if suitable. In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, additional requirements can be given in data block 5 (see 4.6).