塑料.乙烯/醋酸乙烯酯共聚物（EVAC）热塑性塑料.醋酸乙烯酯含量的测定

[中文适用范围]： 本文件规定了两类测定乙烯/醋酸乙烯酯 (EVAC) 共聚物中醋酸乙烯酯 (VAC) 含量的方法，用于根据 ISO 21301-1 指定此类共聚物。一类称为“参考方法”，另一类称为“测试方法”。 “参考方法”用于校准用于测定乙烯/醋酸乙烯酯共聚物中醋酸乙烯酯含量的方法。 “测试方法”是其他方法，如果使用第 4 条中描述的参考方法之一进行校准，则可用于测定，前提是它们具有一定的可允许重复性。 [外文原描述]： This document specifies two categories of method for the determination of the vinyl acetate (VAC) content of ethylene/vinyl acetate (EVAC) copolymer, for use in the designation of such copolymers according to ISO 21301-1. One category is referred to as “reference methods”, the other as “test methods”. The “reference methods” are used to calibrate the method used for the determination of the vinyl acetate content of ethylene/vinyl acetate copolymers. The “test methods” are other methods which can be used for the determination if they are calibrated using one of the reference methods described in Clause 4, provided they show a certain permissible repeatability.