Fluorinated ethylene propylene
is a copolymer
. It differs from the PTFE
) resins in that it is melt-processible using conventional injection molding and screw extrusion techniques. Fluorinated ethylene propylene was invented by DuPont
and is sold under the brandname Teflon® FEP. Other brandnames are Neoflon® from Daikin
or Dyneon® FEP from Dyneon/3M.
FEP is very similar in composition to the fluoropolymers PTFE
. FEP and PFA both share PTFE's useful properties of low friction and non-reactivity, but are more easily formable. FEP is softer than PTFE and melts at 260 °C; it is highly transparent and resistant to sunlight.
- Fluoro Ethylene Propylene
Useful comparison tables of PTFE
can be found on DuPonts website, listing the mechanical, thermal, chemical, electrical and vapour properties of each, side by side.
In terms of corrosion resistance, FEP is the only other readily available fluoropolymer that can match PTFE's own resistance to caustic agents, as it is a pure carbon-fluorine structure and fully fluorinated .
Thermally, FEP stands out from PTFE and PFA by having a melting point of , around forty degrees lower than PFA and lower again than PTFE .
Electrically, PTFE, FEP and PFA have identical dielectric constants, but FEP's dielectric strength is... Read More