PFA

PFA is a completely fluorinated copolymer that has small branches, which vary according to its copolymer, and thermomechanical properties that are based on the type and number of its lateral chains. As a guideline, a higher number of lateral chains corresponds to a lower stability at high temperatures as well as a lower melting point and creep resistance, but greater flexibility and resilience of the material. A variable that allows one to adjust some characteristics of this polymer is the molecular weight: by playing with this, one can have better workability, or lower viscosity of the material, which goes, however, to the detriment of its mechanical properties and resistance. PFA combines the conventional techniques of thermoplastic resin processing (extrusion, injection molding, etc.) with the exceptional properties of PTFE. PFA is the only thermoplastic polymer that can be processed in the melted state and can compete with the work temperature range of PTFE, making it suitable for use in both high and low temperature conditions and with chemically aggressive substances. A typical property of the fluoropolymers is resistance to aggressive chemical agents, even to strong oxidants (ex. Ozone), that unites with resistance to atmospheric agents and sunlight. PFA is a pure polymer that does not need stabilizers, plasticizers, lubricants, or flame retardants. It also exhibits optimal anti-adhesion properties to almost all glues and varnishes. In commerce one can find it in various forms, such as granules for the production of prophylactics or even as aqueous dispersions for coatings and impregnation.