# ISO 787-9:1981 — Withdrawn and superseded ISO standards

For ISO 787-9:1981, item title is General methods of test for pigments and extenders — Part 9: Determination of pH value of an aqueous suspension; status code is 9599; successor is ISO 787-9:2019; withdrawn / published date is 1981-09-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 787-9:1981 _(verified: appears in the quote below)_
- **Item title:** General methods of test for pigments and extenders — Part 9: Determination of pH value of an aqueous suspension _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 787-9:2019
- **Withdrawn / published date:** 1981-09-01 _(verified: appears in the quote below)_

## What the source says

> 5084,IS,,ISO 787-9:1981,General methods of test for pigments and extenders — Part 9: Determination of pH value of an aqueous suspension,Méthodes générales d'essai des pigments et matières de charge — Partie 9: Détermination du pH d'une suspension aqueuse,1981-09-01,1,['87.060.10'],ISO/TC 256,9599,,[74765],"['en','fr']",2,"<p>The water used shall be freshly distilled water, boiled before use, but for 5 to 10 min only, in order to avoid an increase of its pH value due to alkali dissolved from the glass. Preparation of a suspension of the material under test, stopper the container, shaking, allow to stand any time, removing the stopper and determination, to the nearest 0.1 unit, of the pH value

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).