# ISO 4491:1978 — Withdrawn and superseded ISO standards

For ISO 4491:1978, item title is Metallic powders — Determination of loss of mass on hydrogen reduction (hydrogen loss); status code is 9599; successor is ISO 4491-2:1989; withdrawn / published date is 1978-06-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 4491:1978 _(verified: appears in the quote below)_
- **Item title:** Metallic powders — Determination of loss of mass on hydrogen reduction (hydrogen loss) _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 4491-2:1989
- **Withdrawn / published date:** 1978-06-01 _(verified: appears in the quote below)_

## What the source says

> 10383,IS,,ISO 4491:1978,Metallic powders — Determination of loss of mass on hydrogen reduction (hydrogen loss),Poudres métalliques — Détermination de la perte de masse après réduction par l'hydrogène (perte dans l'hydrogène),1978-06-01,1,['77.160'],ISO/TC 119/SC 2,9599,,[10385],"['en','fr']",4,

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).