本文件解释了ISO 11171:2016中定义的两种可接受的粒度报告方法µm（c）和µm（b）的使用。它还解释了存在两种替代尺寸报告方法的原因及其对颗粒计数和过滤β比率数据的影响。交叉引用:ISO 11171:2016ISO 4402:1991ISO 16889购买本文件时提供的所有现行修订版均包含在购买本文件中。

This document explains the use of the two acceptable methods of reporting particle size, µm(c) and µm(b), that are defined in ISO 11171:2016. It also explains the reasons for the existence of two alternative size reporting methods and its implications with respect to particle count and filter Beta Ratio data.Cross References:ISO 11171:2016ISO 4402:1991ISO 16889All current amendments available at time of purchase are included with the purchase of this document.