PFA is a semi-crystalline, perfluorinated copolymer, which consists of tetrafluoroethylene (TFE) and perfluoropropylvinylether. Due to the high fluorine fraction in the copolymer, PFA has the highest known temperature rating and the highest known resistance to chemicals between all fluoropolymers, which can be processed from the melt state. That is the reason why PFA is utilised in domains dominated by extreme temperatures and cauterising chemicals. Depending on the alkylvinylether-moiety the service temperature of the copolymer lies between 240°C and 260°C. The variation of the alkylvinylether-moiety influences the properties of PFA in an important manner. If in the copolymer a methylevinylether-sidechain is present (in that case the copolymer is called MFA), the shorter sidechain causes an abasement of the melting point (250°C) however it improves the surface structure of the copolymer. Thus the adhesion power and the bacteria growth on the polymer surface are repressed in an efficient way. In common PFA a propylvinyleether-sidechain is present, which has an increased melting point compared with MFA (260°C).
- interior lining of tanks and valves
- in avionics
- in special cables