标准摘要 [中文适用范围]： 本文件为塑料材料中添加的阻燃剂提供了统一的符号。 [外文原描述]： This document provides uniform symbols for flame retardants added to plastics materials. 展开完整摘要 英文名称Plastics — Symbols and abbreviated terms — Part 4: Flame retardants