# ISO 2561:1974 — Withdrawn and superseded ISO standards

For ISO 2561:1974, item title is Plastics — Determination of residual styrene monomer in polystyrene by gas chromatography; status code is 9599; successor is ISO 2561:2006; withdrawn / published date is 1974-08-01, recorded from its source on 2026-08-05.

- **Identifier:** ISO 2561:1974 _(verified: appears in the quote below)_
- **Item title:** Plastics — Determination of residual styrene monomer in polystyrene by gas chromatography _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 2561:2006
- **Withdrawn / published date:** 1974-08-01 _(verified: appears in the quote below)_

## What the source says

> 7518,IS,,ISO 2561:1974,Plastics — Determination of residual styrene monomer in polystyrene by gas chromatography,Matières plastiques — Détermination du styrène monomère résiduel dans le polystyrène par chromatographie en phase gazeuse,1974-08-01,1,['83.080.20'],ISO/TC 61/SC 5,9599,,[34833],"['en','fr']",3,<p>The specified method is applicable both to styrene homopolymers and to butadiene modified polystyrene. It may be used also for the simultaneous determination of other volatile aromatic hydrocarbons in polystyrene. Dissolution of the polymer sample in chloroform or dichloromethane. Precipitation of the polymer by the addition of methanol and injection of a small volume of the remaining so

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).