# ISO 21018-4:2016 — Withdrawn and superseded ISO standards

For ISO 21018-4:2016, item title is Hydraulic fluid power — Monitoring the level of particulate contamination in the fluid — Part 4: Use of the light extinction technique; status code is 9599; successor is ISO 21018-4:2019; withdrawn / published date is 2016-10-24, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21018-4:2016 _(verified: appears in the quote below)_
- **Item title:** Hydraulic fluid power — Monitoring the level of particulate contamination in the fluid — Part 4: Use of the light extinction technique _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21018-4:2019
- **Withdrawn / published date:** 2016-10-24 _(verified: appears in the quote below)_

## What the source says

> 61846,IS,,ISO 21018-4:2016,Hydraulic fluid power — Monitoring the level of particulate contamination in the fluid — Part 4: Use of the light extinction technique,Transmissions hydrauliques — Surveillance du niveau de pollution particulaire des fluides — Partie 4: Technique d'absorption de lumière,2016-10-24,1,['23.100.60'],ISO/TC 131/SC 6,9599,,[72620],"['en','fr']",11,"<p>ISO 21018-4:2016 specifies a method for the determination of the particulate contamination level using the light extinction technique (also known as light blockage or light obscuration) either online or off-line in containers. It also defines procedures for calibrating the instruments and verifying their correct operation

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).