Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Fluorinated ethylene propylene
Introduction
| FEP | |
|---|---|
| Density[1] | 2150 kg/m3 |
| Flexural modulus(E) | 586 MPa |
| Tensile strength(t) | 23 MPa |
| Elongation @ break | 325% |
| Folding endurance | No break |
| Notch test | |
| Melting point | 260 °C |
| Maximum operating | |
|    temperature | 204 °C |
| Water absorption (ASTM) | <0.01Â % after 24 hours |
| Dielectric constant (Dk) | |
| Â Â Â at 1MHz | 2.1 |
| Dissipation factor | |
| Â Â Â 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.
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]
References
- ↑ “PTFE, FEP, and PFA Specifications”. Boedeker Corp. 2007. Retrieved 2007-12-22.
- ↑ “Teflon FEP”. DuPont. Retrieved 2007-10-17.
- ↑ “FEP Detailed Properties”. Parker-TexLoc. 13 Apr 2006. Retrieved 2006-09-10.