Epoxy vs. FEP
Epoxy belongs to the thermoset plastics classification, while FEP belongs to the thermoplastics. There are 20 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.
For each property being compared, the top bar is epoxy and the bottom bar is FEP.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.4 | |
| 0.43 |
| Elongation at Break, % | 4.5 | |
| 300 |
| Tensile Strength: Ultimate (UTS), MPa | 67 | |
| 20 |
Thermal Properties
| Glass Transition Temperature, °C | 120 | |
| 60 |
| Maximum Temperature: Autoignition, °C | 430 | |
| 630 |
| Maximum Temperature: Mechanical, °C | 130 | |
| 200 |
| Specific Heat Capacity, J/kg-K | 1500 | |
| 1170 |
| Thermal Conductivity, W/m-K | 0.2 | |
| 0.22 |
| Thermal Expansion, µm/m-K | 100 | |
| 95 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 16 | |
| 22 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 | |
| 2.1 |
| Limiting Oxygen Index (LOI), % | 20 | |
| 80 |
| Refractive Index | 1.6 | |
| 1.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.0 | |
| 0.11 |
| Stiffness to Weight: Bending, points | 34 | |
| 12 |
| Strength to Weight: Axial, points | 14 | |
| 2.6 |
| Strength to Weight: Bending, points | 28 | |
| 7.6 |
| Thermal Diffusivity, mm2/s | 0.1 | |
| 0.088 |
| Thermal Shock Resistance, points | 20 | |
| 35 |