FEP (fluorinated ethylene propylene) is a tough, flexible copolymer of tetrafluoroethylene and hexafluoropropylene. It is often used for flexible tubing and fluid processing equipment when chemical resistance, high purity, and low stiffness is required.
FEP has a low coefficient of friction, stress crack resistance, and good electrical properties. It can withstand temperature ranges from -400°F to +392°F and FDA compliant grades are available. Please ask your Curbell Plastics representative for more specific information about an individual brand.
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For a glossary of terms, see our Plastic Properties Descriptions.
TYPICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
4,350 |
| Flexural Modulus of Elasticity |
psi |
D790 |
95,000 |
| Izod Impact (notched) |
ft-lbs/in of notch |
D256 |
no break |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
- |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
<0.01 |
PHYSICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Specific Gravity |
- |
D792 |
2.12 - 2.17 |
Water Absorption
(Immersion 24 hours) |
% |
D570 |
<0.01 |
MECHANICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Tensile Strength |
psi |
D638 |
4,350 |
| Tensile Modulus of Elasticity |
psi |
D638 |
- |
| Tensile Elongation |
% |
D638 |
300 - 325 |
| Flexural Strength |
psi |
D790 |
- |
| Flexural Modulus of Elasticity |
psi |
D790 |
95,000 |
| Compressive Strength |
psi |
D695 |
- |
| Hardness |
scale as noted |
D785, D2240 |
Shore D 55 |
| Izod Impact |
ft-lbs/in |
D256 |
no break |
THERMAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Coefficient of Linear Thermal Expansion |
in/in/°F x 10-5 |
D696 |
7.5 |
| Heat Deflection Temperature (66psi / 264psi) |
°F |
D648 |
- |
| Max Continuous Service Temperature In Air |
°F |
- |
392 |
ELECTRICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Dielectric Strength |
V/mil |
D149 |
500 |
OPTICAL PROPERTIES
| |
UNITS |
ASTM TEST |
|
| Light Transmittance |
% |
D1003 |
- |
| Haze |
% |
D1003 |
- |
OTHER
| |
UNITS |
ASTM TEST |
|
| Coefficient of Friction |
- |
Dynamic |
0.25 |
Values may vary according to brand name. Please ask your Curbell Plastics representative for more specific information about an individual brand.
Still Not Sure if You Need FEP? Research FEP or Ask a Plastics Expert.