FEP
Density[1]	2150 kg/m3
Flexural modulus(E)	586 MPa
Tensile strength(t)	23 MPa
Elongation @ break	325%
Folding endurance	Varies
Notch test
Melting point	260 °C
Maximum operating
temperature	204 °C
Water absorption (ASTM)	<0.01 % after 24 hours
Dielectric constant (Dk)
at 1MHz	2.1
Dissipation factor
at 1MHz	0.0007
Arc resistance	< 300 seconds
Resistivity at 50% R.H.	> 1016 Ω m

Fluorinated ethylene propylene, Teflon-FEP, or FEP is a copolymer of hexafluoropropylene and tetrafluoroethylene. It differs from the PTFE (polytetrafluoroethylene) 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. Similar product is available from Daikin with the brand name of Neoflon-FEP.

FEP is very similar in composition to the fluoropolymers PTFE (polytetrafluoroethylene) and PFA (perfluoroalkoxy polymer resin). 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.^[2][3]

[edit] Alternative spellings

• Fluoro Ethylene Propylene

[edit] References

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