本文件建立了聚甲醛（POM）热塑性材料的名称体系，可作为规范的基础。注:聚甲醛材料是热塑性材料，主要由长链合成均聚物和甲醛共聚物组成。分子链中的重复单元是？二氧化碳？作为甲醛聚合的主要聚合物链的组成部分。聚甲醛塑料的类型通过一个基于以下指定性质的适当等级的分类系统进行区分:a） 熔体质量流量或熔体体积流量；b） 拉伸模量，以及有关聚合物基本参数、预期用途、加工方法、重要性能、添加剂、着色剂、填料和增强材料的信息。本文件适用于所有聚甲醛均聚物以及聚甲醛的共聚物和含有聚甲醛的聚合物的混合物。它适用于以粉末、颗粒或颗粒形式准备正常使用的材料，以及未经着色剂、添加剂、填料等修改和改性的材料。它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最终用途的材料。如果需要此类附加性能，则应根据相关国际标准规定的试验方法进行测定。

This document establishes a system of designation for polyoxymethylene (POM) thermoplastic material, which can be used as the basis for specifications. NOTE Polyoxymethylene materials are thermoplastic materials composed principally of long-chain synthetic homopolymers and copolymers of formaldehyde. The repeating unit in the molecular chain is?CH2O?as an integral part of the main polymer chain resulting from polymerization of formaldehyde. The types of polyoxymethylene plastic are differentiated from each other by a classification system based on appropriate levels of the following designatory properties: a) melt mass-flow rate or melt volume-flow rate; b) tensile modulus, and on information about basic polymer parameters, intended application, method of processing, important properties, additives, colorants, fillers and reinforcing materials. This document is applicable to all polyoxymethylene homopolymers and to copolymers of polyoxymethylene and blends of polymers containing polyoxymethylene. It applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified and modified by colorants, additives, fillers, etc. It is not intended to imply that materials having the same designation necessarily give the same performance. This document does not provide engineering data, performance data or data on processing conditions which can be required to specify materials for particular end-use applications. If such additional properties are required, they are to be determined in accordance with the test methods specified by the relevant International Standard.