PTFE (polytetrafluoroethylene) was the first fluorocarbon. It is the most chemically resistant plastic known. Only a few chemicals react with it. Its mechanical properties are low compared to other engineering plastics, but its properties remain at a useful level over a great temperature range (-400° to 500° F).
Mechanical properties can be improved by the addition of fillers such as glass fiber, carbon, graphite, molybdenum disulfide and bronze.
PTFE has excellent thermal and electrical insulation properties. And it has a low coefficient of friction. It is difficult to make anything adhere to PTFE. A material may stick to it, but the material can be peeled off or rubbed off. PTFE is not melt processible. It cannot be injection or blow molded, extruded by conventional means, nor vacuum formed. The resin must be compressed, then sintered (a controlled heat treatment) to produce a useful plast