本文件规定了三种非泡沫塑料密度测定方法，其形式为无空隙的模制或挤压物体，以及粉末、薄片和颗粒。 -方法A:浸入法，适用于无空隙的固体塑料（粉末除外）。 -方法B:液体比重瓶法，用于颗粒、粉末、薄片、颗粒或小块成品零件。 -方法C:滴定法，适用于任何无空隙形式的塑料。 注:密度通常用于跟踪塑料材料物理结构或成分的变化。 密度也可用于评估样品或试样的均匀性。通常，塑料材料的密度取决于试样制备方法的选择。在这种情况下，试样制备方法的准确细节应包含在适当的材料规范中。本说明适用于所有三种方法。

This document specifies three methods for the determination of the density of non-cellular plastics in the form of void-free moulded or extruded objects, as well as powders, flakes and granules. — Method A: Immersion method, for solid plastics (except for powders) in void-free form. — Method B: Liquid pycnometer method, for particles, powders, flakes, granules or small pieces of finished parts. — Method C: Titration method, for plastics in any void-free form. NOTE Density is frequently used to follow variations in physical structure or composition of plastic materials. Density can also be useful in assessing the uniformity of samples or specimens. Often, the density of plastic materials depend upon the choice of specimen preparation method. When this is the case, precise details of the specimen preparation method are intended to be included in the appropriate material specification. This note is applicable to all three methods.