# ISO 305:1990 — Withdrawn and superseded ISO standards

For ISO 305:1990, item title is Plastics — Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds — Discoloration method; status code is 9599; successor is ISO 305:2019; withdrawn / published date is 1990-04-12, recorded from its source on 2026-08-05.

- **Identifier:** ISO 305:1990 _(verified: appears in the quote below)_
- **Item title:** Plastics — Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds — Discoloration method _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 305:2019
- **Withdrawn / published date:** 1990-04-12 _(verified: appears in the quote below)_

## What the source says

> 4240,IS,,ISO 305:1990,"Plastics — Determination of thermal stability of poly(vinyl chloride), related chlorine-containing homopolymers and copolymers and their compounds — Discoloration method","Plastiques — Détermination de la stabilité thermique du poly(chlorure de vinyle), des homopolymères et copolymères chlorés apparentés et de leurs compositions — Méthode du changement de couleur",1990-04-12,2,['83.080.20'],ISO/TC 61/SC 9,9599,[4239],[70415],"['en','fr']",4,"<p>Specification of a comparing method, based on the increasing discoloration of polyvinylchloride when exposed to heat, due to a decomposition reaction. Test pieces in diskform are placed between aluminium pieces and heated to the

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).