After the extrusion process the PTFE-insulation contains a high portion of resolvent (e.g. Isopar), which must be removed for the biggest part within the vaporizer. To do so, the material is carefully being heated, the resulting vapors are evacuated by any exhaust system. Following the product passes a sintering preocess, where the PTFE receives it's final stability by again heating up to even higher tempartures with subsequent air cooling. To avoid explosions of the resolvent vapors it is mandatory required to to this heating process in these 2 steps.