LDPE vs. FEP
Both LDPE and FEP are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (17, 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 LDPE and the bottom bar is FEP.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 0.3 | |
| 0.43 |
| Tensile Strength: Ultimate (UTS), MPa | 7.0 | |
| 20 |
Thermal Properties
| Glass Transition Temperature, °C | -130 | |
| 60 |
| Maximum Temperature: Autoignition, °C | 380 | |
| 630 |
| Melting Onset (Solidus), °C | 110 | |
| 260 |
| Specific Heat Capacity, J/kg-K | 2300 | |
| 1170 |
| Thermal Conductivity, W/m-K | 0.36 | |
| 0.22 |
| Thermal Expansion, µm/m-K | 220 | |
| 95 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 2.3 | |
| 1.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 0.92 | |
| 2.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 0.18 | |
| 0.11 |
| Stiffness to Weight: Bending, points | 24 | |
| 12 |
| Strength to Weight: Axial, points | 2.1 | |
| 2.6 |
| Strength to Weight: Bending, points | 8.8 | |
| 7.6 |
| Thermal Diffusivity, mm2/s | 0.17 | |
| 0.088 |
| Thermal Shock Resistance, points | 7.6 | |
| 35 |