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ISO/DIS 4021

Hydraulic fluid power — Particulate contamination analysis — Extraction of fluid samples from lines of an operating system

General information

40.20     Mar 19, 2026

ISO

ISO/TC 131/SC 6

International Standard

23.100.60  

Scope

The preferred method is to extract fluid samples from a main flowline in such a manner that the particulate contaminant in the sample is representative of the fluid flowing at the point of sampling. An alternative method is to extract a sample from the reservoir, but this method should only be used if a suitable sampler is not fitted.

Life cycle

PREVIOUSLY

PUBLISHED
ISO 4021:1992

NOW

IN_DEVELOPMENT
ISO/DIS 4021
40.20 DIS ballot initiated: 12 weeks
Mar 19, 2026

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