Thermoplastics pipes — Longitudinal reversion — Test method and parameters

Adopted by the Council as a standard on 13/04/2026

Sector: Mechanical and Metals

Project Method: Adoption with modification

Project Type: New

International Classification for Standards (ICS)

Code	Classification
23.040.20	Plastics pipes

Adopted Standard

	Standards / Amendment / Corrigendum
1	ISO 2505:2023

Scope

This document specifies a method for determining the longitudinal reversion of thermoplastics pipes,
to be carried out in either a liquid or in air. In case of dispute, heated liquid is used as the reference.
This document is applicable to all thermoplastics pipes with smooth internal and external walls of
constant cross‑section. It is not applicable to non‑smooth structured‑wall thermoplastics pipes.
The parameters appropriate to the pipe material and recommendations for the maximum levels of
reversion as a function of the pipe material are given in Annex A.
This method is applicable for pipes of wall thickness ≤ 16 mm.