... cast package PTFE rode Polytetrafluoroethylene [PTFE, F4] is one of the best corrosion resistance material in the world today, so ... as a sealing material and filler material. A high degree of chemical stability and excellent resistance to chemical corrosion, acids, ... +250 ° C, there excellent electrical insulation, and not the effects of temperature and frequency. In addition, it has not stained, non- ...