# ISO 501:1981 — Withdrawn and superseded ISO standards

For ISO 501:1981, item title is Coal — Determination of the crucible swelling number; status code is 9599; successor is ISO 501:2003; withdrawn / published date is 1981-11-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 501:1981 _(verified: appears in the quote below)_
- **Item title:** Coal — Determination of the crucible swelling number _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 501:2003
- **Withdrawn / published date:** 1981-11-01 _(verified: appears in the quote below)_

## What the source says

> 4556,IS,,ISO 501:1981,Coal — Determination of the crucible swelling number,Charbon — Détermination de l'indice de gonflement au creuset,1981-11-01,2,['73.040'],ISO/TC 27,9599,,[33607],"['en','fr']",5,"<p>The sample is heated in a covered crucible under standard conditions to a final temperature of 820 +- 5 °C. The coke button obtained is classified by comparison with the outlines of a set of standard profiles. The number of the profile most closely corresponding to the coke button obtained is the crucible swelling number. Gas or electrical heating may be used. When using an electrically heated apparatus, the results obtained should be the same (within 1/2 unit) as those obtained by the gas h

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).