# ISO 720:1985 — Withdrawn and superseded ISO standards

For ISO 720:1985, item title is Glass — Hydrolytic resistance of glass grains at 121 degrees C — Method of test and classification; status code is 9599; successor is ISO/WD 720 | ISO 720:2020; withdrawn / published date is 1985-10-10, recorded from its source on 2026-08-05.

- **Identifier:** ISO 720:1985 _(verified: appears in the quote below)_
- **Item title:** Glass — Hydrolytic resistance of glass grains at 121 degrees C — Method of test and classification _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO/WD 720 | ISO 720:2020
- **Withdrawn / published date:** 1985-10-10 _(verified: appears in the quote below)_

## What the source says

> 4950,IS,,ISO 720:1985,Glass — Hydrolytic resistance of glass grains at 121 degrees C — Method of test and classification,Verre — Résistance hydrolytique du verre en grains à 121 degrés C — Méthode d'essai et classification,1985-10-10,2,['81.040.01'],ISO/TC 76,9599,[4949],"[26924,77844]","['en','fr']",5,"<p>The principle, reagents, apparatus and the procedure are specified. The resistance is expressed by the volume of acid required for titration of the alkali extracted from the unit mass of glass. The permissible range of the values obtained and the limit values in the hydrolytic resistance grain test are listed.</p>"

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).