FEP is established for its excellent chemical resistance, outstanding electrical properties and a wide service temperature range extending up to 400 deg F. A list of its key properties is shown in the table below. FEP is UV light transparent – a property that is effectively utilized in water disinfecting by ultra violet light of the appropriate wavelength. FDA regulation 21 CFR 177.1550 is applicable to FEP for use as article or components of articles intended to contact food. FEP is classified as USP Class VI and applies to tubing products.
FEP - Fluorinated ethylene propylene - TYPICAL PROPERTIES
| Property | Value | Units | Method |
| MECHANICAL PROPERTIES | |||
| Tensile Strength, 73°F | 2100-3050 14.5 to 21 |
psi MPa |
|
| Elongation, 73°F | 240 - 300 | % | |
| Flexural Strength, 73°F | No break at flexure | D 790 | |
| Impact Strength, Izod | No break | ||
| Yield Strength At 23 deg C |
1740 12 |
psi MPa |
|
| Density (as polymerized) | 2.12 to 2.17 | gm/cu.cm | |
| THERMAL PROPERTIES | |||
| Coefficient
of Linear Expansion 20 to 100 deg C |
12 x 10-5 | K-1 | D 696 |
| Melting Point | 487 - 540 253 - 282 |
deg F deg C |
|
| Thermal Conductivity | 1.45 0.209 |
Btu/hr-.ft-deg
F W/m/deg K |
|
| Heat Distortion Temperature, 66 lb/sq.in (0.455 MPa) | 158 to 171 70 - 77 |
deg F deg C |
D 648 |
| Service Temperature | -418 to 403 -250 to 206 |
deg F deg C |
|
| Processing Temperature | 698 - 743 370 - 395 |
deg F deg C |
|
| ELECTRICAL PROPERTIES | |||
| Dielectric Strength, short time, 0.080” | MV m-1 | ||
| Surface Arc-Resistance | >300 (does not track) | sec | D 495 |
| Volume Resistivity, dry, @ 50% RH | >1018 | ohm-cm | D 257 |
| Surface Resistivity, @ 100% RH | 1016 | Ohm/sq | D 257 |
| Dielectric Constant, 60 to 2 x 109 cps | 2.1 | ε | D150-81 |
| Dielectric Strength | 13-100 | kV mm-1 | D149 |
| Dissipation Factor @ 60 Hz - 1 MHz | <0.0001 | D150-81 | |
| OTHER PROPERTIES | |||
| Refractive Index | 1.344 | nD 25 | D 542 |
| Water Absorption | <0.1 | % | D570-81 |
| Flame Rating+ | VE-0 | UL-94 | |
| Limiting Oxygen Index | 95 | % Oxygen | D 2863 |
| Resistance to Weathering | Excellent | ||
| Specific Gravity | 2.1-2.3 | D792-66 (1979) | |
| Coefficient of friction | 0.27 – 0.67 | D 1894 | |
| CO2 Permeability | 273 | Ng cm m-2 s-1 | |
| O2 Permeability | 637 | Ng cm m-2 s-1 | |
| N2 Permeability | 91 | Ng cm m-2 s-1 | |
+ Numerical rating for flame spread is not intended to reflect hazards presented by this or any other material under actual fire conditions
NOTE: The information, recommendations and opinions contained herein is only a guide and is intended solely for your consideration, inquiry and verification. The suitability of any material under specific conditions of application is not guaranteed in any manner. Fluorotherm Polymers Inc does not assume legal responsibility for the use of data presented here in any form, under any circumstances, any application, test or communication. Nothing contained herein is to be interpreted as a license or authorization to operate under or infringe any patent.