# ISO 291:1977 — Withdrawn and superseded ISO standards

For ISO 291:1977, item title is Plastics — Standard atmospheres for conditioning and testing; status code is 9599; successor is ISO 291:1997; withdrawn / published date is 1977-12-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 291:1977 _(verified: appears in the quote below)_
- **Item title:** Plastics — Standard atmospheres for conditioning and testing _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 291:1997
- **Withdrawn / published date:** 1977-12-01 _(verified: appears in the quote below)_

## What the source says

> 4215,IS,,ISO 291:1977,Plastics — Standard atmospheres for conditioning and testing,Plastiques — Atmosphères normales de conditionnement et d'essai,1977-12-01,1,['83.080.01'],ISO/TC 61/SC 6,9599,,[25543],"['en','fr']",2,

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).