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ISO 4406:2021

Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles

Publication date:   Jan 7, 2021

General information

90.93   Standard confirmed   Jun 29, 2026

ISO

ISO/TC 131/SC 6 Contamination control

International Standard

23.100.60   Filters, seals and contamination of fluids | 75.120   Hydraulic fluids

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Scope

This document specifies the code to be used in defining the quantity of solid particles in the fluid used in a given hydraulic fluid power system.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 4406:2017

NOW

PUBLISHED
ISO 4406:2021
90.93 Standard confirmed
Jun 29, 2026