本文件规定了乙烯/醋酸乙烯酯（EVAC）共聚物中醋酸乙烯酯（VAC）含量的两类测定方法，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“试验方法”。 “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。 “试验方法”是指如果使用第4条所述的参考方法之一进行校准，可用于测定的其他方法，前提是它们显示出一定的允许重复性。

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.