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ISO/PWI 26775

Particle Size and Concentration Measurement –– multi-wavelength light extinction method

General information

Current stage: 00.00 Effective date: May 10, 2026

Originator: ISO

Owner: ISO/TC 24/SC 4

Type: International Standard

Scope

This document describes how to measure a light extinction spectrum at several fixed wavelengths and how to transform the spectrum into information on particle size and concentration. The applicable size range is 0,1 to 10 μm at a concentration of 0,01% to 1% by volume.

Life cycle

NOW

IN_DEVELOPMENT
ISO/PWI 26775
00.00 Proposal for new project received
May 10, 2026