PMP vs. FEP
Both PMP and FEP are thermoplastics. There are 20 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is PMP and the bottom bar is FEP.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 1.1 | |
| 0.43 |
| Elongation at Break, % | 30 | |
| 300 |
| Tensile Strength: Ultimate (UTS), MPa | 24 | |
| 20 |
Thermal Properties
| Glass Transition Temperature, °C | 30 | |
| 60 |
| Maximum Temperature: Mechanical, °C | 140 | |
| 200 |
| Melting Onset (Solidus), °C | 230 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 1750 | |
| 1170 |
| Thermal Conductivity, W/m-K | 0.17 | |
| 0.22 |
| Thermal Expansion, µm/m-K | 120 | |
| 95 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 2.1 | |
| 1.9 |
| Dielectric Strength (Breakdown Potential), kV/mm | 28 | |
| 22 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 14 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 0.83 | |
| 2.1 |
| Refractive Index | 1.5 | |
| 1.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 0.74 | |
| 0.11 |
| Stiffness to Weight: Bending, points | 41 | |
| 12 |
| Strength to Weight: Axial, points | 8.0 | |
| 2.6 |
| Strength to Weight: Bending, points | 22 | |
| 7.6 |
| Thermal Diffusivity, mm2/s | 0.12 | |
| 0.088 |
| Thermal Shock Resistance, points | 13 | |
| 35 |