ISO 4406:2021

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

Publication date: Jan 7, 2021

General information

Current stage: 90.20 Effective date: Jan 15, 2026

Originator: ISO

Owner: ISO/TC 131/SC 6

Type: International Standard

ICS: 23.100.60 75.120

Languages: English

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Status: Published

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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WITHDRAWN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
90.20 Standard under periodical review
Jan 15, 2026

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