# ISO 9020:1994 — Withdrawn and superseded ISO standards

For ISO 9020:1994, item title is Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method; status code is 9599; successor is ISO 11402:2004 | ISO/DIS 11402; withdrawn / published date is 1994-02-03, recorded from its source on 2026-08-05.

- **Identifier:** ISO 9020:1994 _(verified: appears in the quote below)_
- **Item title:** Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 11402:2004 | ISO/DIS 11402
- **Withdrawn / published date:** 1994-02-03 _(verified: appears in the quote below)_

## What the source says

> 16564,IS,,ISO 9020:1994,Binders for paints and varnishes — Determination of free-formaldehyde content of amino resins — Sodium sulfite titrimetric method,Liants pour peintures et vernis — Détermination de la teneur en formaldéhyde libre dans les résines aminoplastes — Méthode titrimétrique au sulfite de sodium,1994-02-03,1,['87.060.20'],ISO/TC 35,9599,,"[39058,29197]","['en','fr']",4,"<p>The method specified is based on reacting free formaldehyde and alcohol formaldehyde semiacetals in a test portion with excess sodium sulfite solution at a temperature of 0 °C to form hydroxymethane sulfonate, titrating the excess sodium sulfite with iodine solution, decomposing hydroxymethane sulfonate with

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).