PTFE belongs to the group of thermoplastics but cannot be processed using the standard techniques for thermo-plastics such as e.g. injection molding. The very high molecular weight results in a too high melt viscosity and allows PTFE to be processed only with the special press and sinter methods as used in the manufacture of sintered ceramics. PTFE powder is compressed under very high pressure followed by a sintering procedure in which the PTFE particles fuse together. Please refer to the competence area for a detailed explanation of the manufacture of semi-finished products.