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Status : Active
Standard Type : Main
Document No : ISO/TR 22681:2019
Document Year : 2019
Pages : 8
Edition : 1
Section Volume : Contamination control (ISO/TC 131/SC 6.)
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.