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Performance-Plastics - Fluorinated Ethylene Propylene (FEP)
FEP and PFA are injection moldable, highly inert, compatible with most organic compounds, have good barrier properties and high continuous use temperatures. They are virtually impervious to chemical, enzyme and microbiological attack and stiffer than PTFE. The non-stick properties of these polymers can also be useful to reduce liquid, gel and powder adhesion. Fluoropolymers in general, have good dielectric properties and are resistant to atmospheric degradation.
While significantly less expensive than PFA, FEP is very difficult to mold due to its low viscosity. However, Performance Plastics has developed proprietary tooling and processes enabling the injection molding of small, thin-walled, complex FEP parts.
- More transparent than PTFE (not injection moldable)
- Better gas and vapor permeability properties than PTFE
- Maximum working temperature 400°F
- Approximately 1/3 the cost of PFA
PFA is significantly easier to mold than FEP, however, it is significantly more expensive.
- Higher continuous service temperature than FEP
- Maximum working temperature 500°F
- Difference in molecular structure gives PFA improved flow, creep resistance and thermal stability.