ISO/DIS 4021

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

General information

Current stage: 40.00 Effective date: 5 jan 2026

Originator: ISO

Owner: ISO/TC 131/SC 6

Type: International Standard

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
40.00 DIS registered
5 jan 2026