Published
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.
WITHDRAWN
ISO 4406:2017
PUBLISHED
ISO 4406:2021
90.20
Standard under periodical review
Jan 15, 2026
Hydraulic fluid power — Fluids — Method for coding the level of contamination by solid particles
90.20 Standard under periodical review
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