UP vs. FEP
UP belongs to the thermoset plastics classification, while FEP belongs to the thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.
For each property being compared, the top bar is UP and the bottom bar is FEP.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 17 | |
| 0.43 |
| Elongation at Break, % | 1.0 | |
| 300 |
| Tensile Strength: Ultimate (UTS), MPa | 30 | |
| 20 |
Thermal Properties
| Glass Transition Temperature, °C | 60 | |
| 60 |
| Specific Heat Capacity, J/kg-K | 1200 | |
| 1170 |
| Thermal Conductivity, W/m-K | 0.7 | |
| 0.22 |
| Thermal Expansion, µm/m-K | 3.0 | |
| 95 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 6.0 | |
| 1.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.0 | |
| 2.1 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 80 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.7 | |
| 0.11 |
| Stiffness to Weight: Bending, points | 43 | |
| 12 |
| Strength to Weight: Axial, points | 4.2 | |
| 2.6 |
| Strength to Weight: Bending, points | 11 | |
| 7.6 |
| Thermal Diffusivity, mm2/s | 0.29 | |
| 0.088 |
| Thermal Shock Resistance, points | 42 | |
| 35 |