本文件规定了粒度加权细分数（SWFF）和粒度加权细分数的测定 通过沉淀法在散装材料中获得结晶二氧化硅（SWFFCS）的细分数 方法采用液体沉淀技术。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies the determination of the size-weighted fine fraction (SWFF) and the size-weighted fine fraction of crystalline silica (SWFFCS) in bulk materials by means of a sedimentation method using a liquid sedimentation technique.All current amendments available at time of purchase are included with the purchase of this document.