DVS 2207-6-2002 Butt welding processes, machines, parameters for non-contact heating elements of welded pipes, pipe components and panels of thermoplastics
DIN 16962-5:2000 Pipe joints and components of polypropylene (PP) for pipes under pressure, PP-H 100, PP-B 80 and PP-R 80 - Part 5: General quality requirements, testing
2003DVS 2207-6-2003 "Welding of thermoplastics - Non-contact heated tool butt welding of pipes, pipeline components and sheets - Methods, equipment, parameters"
2002DVS 2207-6-2002 Butt welding processes, machines, parameters for non-contact heating elements of welded pipes, pipe components and panels of thermoplastics