Welding Guideline Released in Europe
Surely you are familiar with the GKFP technical guideline for butt-welding, which describes the current state of the art for angled welding of PVC windows.
There is now a European edition of this guideline. It was created by editing the paper from the EPPA and the “Windows Group” of the British Plastics Federation (BPF) and then distributed. The European version can be downloaded as a PDF from the EPPA website.
The edition of the Gütegemeinschaft can be found under Publications.