This European Standard 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.
This European Standard applies to the following thermoplastic materials:
Table 1
Abbreviation Material description
ABS Acrylonitrile-butadiene-styrene plastic
ECTFE Ethylene-chlorotrifluoroethylene copolymer
FEP Fluorinated ethylene propylene
PB Polybutylene
PE Polyethylene
PFA Perfluoroalkoxy
PP-B Polypropylene block copolymer
PP-H Polypropylene homopolymer
PP-R Polypropylene random copolymer
PVC-C Chlorinated polyvinyl chloride
PVC-U Unplasticised polyvinyl chloride (rigid PVC)
PVDF Polyvinylidene fluoride

and to the following welding processes:
- Heated tool welding;
- Electrofusion welding;
- Hot gas welding using filler rod only;
- Extrusion welding;
- Solvent welding of pipes.