# ISO 21807:2004 — Withdrawn and superseded ISO standards

For ISO 21807:2004, item title is Microbiology of food and animal feeding stuffs — Determination of water activity; status code is 9599; successor is ISO 18787:2017; withdrawn / published date is 2004-09-13, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21807:2004 _(verified: appears in the quote below)_
- **Item title:** Microbiology of food and animal feeding stuffs — Determination of water activity _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 18787:2017
- **Withdrawn / published date:** 2004-09-13 _(verified: appears in the quote below)_

## What the source says

> 34728,IS,,ISO 21807:2004,Microbiology of food and animal feeding stuffs — Determination of water activity,Microbiologie des aliments — Détermination de l'activité de l'eau,2004-09-13,1,['07.100.30'],ISO/TC 34/SC 9,9599,,[63379],"['en','fr']",7,"<p>ISO 21807:2004 gives basic principles and requirements for physical methods of determining the water activity of products intended for human consumption and the feeding of animals.</p><p>Water activity can be used to predict microbial growth and determine the microbiological stability of a food product, and it also provides an important, quantitatively determinable criterion for estimating the times for which a foodstuff can be kept.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).