scope:

This document provides quality levels for imperfections in thermoplastics welded joints. It applies to material thickness above 2,0 mm.

Three quality levels are given in order to permit application for a wide range of welded fabrication. They are designated by symbols B, C and D, where B is the most stringent. The quality levels refer to production quality and not to the fitness-for-purpose (see 3.2) of the manufactured product.

and to the following welding processes:

- heated tool welding;

- electrofusion welding;

- hot gas welding using filler rod only;

- extrusion welding;

- solvent welding of pipes.