FEP vs. PAS
Both FEP and PAS are thermoplastics. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is FEP and the bottom bar is PAS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 0.43 | |
| 2.7 |
| Elongation at Break, % | 300 | |
| 40 |
| Flexural Modulus, GPa | 0.6 | |
| 2.8 |
| Flexural Strength, MPa | 24 | |
| 110 |
| Tensile Strength: Ultimate (UTS), MPa | 20 | |
| 83 |
Thermal Properties
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 50 | |
| 200 |
| Thermal Expansion, µm/m-K | 95 | |
| 49 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 1.9 | |
| 3.5 |
| Dielectric Constant (Relative Permittivity) At 1 MHz | 2.0 | |
| 3.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 22 | |
| 15 |
| Electrical Dissipation At 1 Hz | 0.00026 | |
| 0.0017 |
| Electrical Dissipation At 1 MHz | 0.00065 | |
| 0.0056 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 16 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.1 | |
| 1.4 |
| Limiting Oxygen Index (LOI), % | 80 | |
| 33 |
| Water Absorption After 24 Hours, % | 0.010 | |
| 0.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 0.11 | |
| 1.1 |
| Stiffness to Weight: Bending, points | 12 | |
| 34 |
| Strength to Weight: Axial, points | 2.6 | |
| 17 |
| Strength to Weight: Bending, points | 7.6 | |
| 31 |
| Thermal Shock Resistance, points | 35 | |
| 45 |