Pekutherm® Purging Compound(s) was originally developed in the 1970’s by German extrusion engineers and technicians who were on the forefront (at the time) for PolyCarbonate double wall, and then triple walled (PC) sheeting. This process was also being applied to Acrylic sheeting at that time with the eventual needs for other engineering grade plastics.
The problem was the material changeovers and black specs ... trying out different formulations of Polycarbonates and Acrylic that were best suited for each phase of experimentation, they (the technicians) needed to absolutely remove the previous formulation of materials lest they carry over into the new run, and they could potentially have “blended results”. The Purging Compounds they tried had one problem they always had a carrier resin, and that resin or its by products would end up in the next run. The purging compounds did not really remove all the materials; it just kinda got “most of it”. In the end, they really didn’t know if they were clean or not. They also had an ongoing problem with PC in that it would “always turn into black specs” given time and temperature. The scientists knew they had to remove all the previous plastic ... all of it! PEKUTHERM after many trials and experiments lived up to their rigorously high expectation, and allowed them them to produce parts in PC and Acrylic. The need for PEKUTHERM has been there since the beginning, from the earliest formulations to today's products.