本标准描述了用于型式试验的参考方法，以及通过测径仪测定填料颗粒密度的争议情况。为了其他目的，特别是工厂生产控制，可以使用其他方法，条件是与参考方法建立适当的工作关系

This standard describes the reference method used for type testing and in cases of dispute for the determination of the particle density of filler by means of a pyknometer. For other purposes, in particular factory production control, other methods may be used provided that an appropriate working relationship with the reference method has been established.