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ISO/FDIS 25549

Fine bubble technology — Evaluation method for determining the shear viscosity of ultrafine bubble dispersions

General information

50.20     May 11, 2026

ISO

ISO/TC 281

International Standard

07.030  

Scope

This document specifies a method for evaluating the shear viscosity of fine bubble dispersions.
Three measurement methods are adopted, namely parallel-plate rotational shear, cone-plate rotational shear and coaxial-cylinder rotational shear. The average effective shear viscosity of the fine bubble dispersion is calculated from the measured stress (or strain rate) and the strain rate (or stress) applied to the sample. These measurement methods are readily accessible in commercially available instruments.

Life cycle

NOW

IN_DEVELOPMENT
ISO/FDIS 25549
50.20 Proof sent to secretariat or FDIS ballot initiated: 8 weeks
May 11, 2026

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