# ISO 9969:1994 — Withdrawn and superseded ISO standards

For ISO 9969:1994, item title is Thermoplastics pipes — Determination of ring stiffness; status code is 9599; successor is ISO 9969:2007; withdrawn / published date is 1994-02-17, recorded from its source on 2026-08-05.

- **Identifier:** ISO 9969:1994 _(verified: appears in the quote below)_
- **Item title:** Thermoplastics pipes — Determination of ring stiffness _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 9969:2007
- **Withdrawn / published date:** 1994-02-17 _(verified: appears in the quote below)_

## What the source says

> 17876,IS,,ISO 9969:1994,Thermoplastics pipes — Determination of ring stiffness,Tubes en matières thermoplastiques — Détermination de la rigidité annulaire,1994-02-17,1,['23.040.20'],ISO/TC 138/SC 5,9599,,[40488],"['en','fr']",5,"<p>The principle of the method specified is vertically compressing a length of pipe supported horizontally between two parallel flat plates moved at a constant speed which is dependent upon the diameter of the pipe, measuring the force and the deflection, plotting the force versus deflection, and calculating the ring stiffness as a function of the force necessary to produce a deflection of 0,03 nominal diameter diametrically across the pipe. Applies to pipes having a

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).