PEI vs. MDF
PEI belongs to the thermoplastics classification, while MDF belongs to the wood-based materials. There are 15 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is PEI and the bottom bar is MDF.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 140 to 180 | |
| 10 |
| Elastic (Young's, Tensile) Modulus, GPa | 3.4 to 5.6 | |
| 4.0 |
| Elongation at Break, % | 3.0 to 34 | |
| 0.5 |
| Tensile Strength: Ultimate (UTS), MPa | 110 to 160 | |
| 18 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 1050 to 1220 | |
| 1700 |
| Thermal Conductivity, W/m-K | 0.18 to 0.23 | |
| 0.3 |
| Thermal Expansion, µm/m-K | 20 to 53 | |
| 12 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 30 to 33 | |
| 0.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 0.75 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 2.1 | |
| 3.0 |
| Stiffness to Weight: Bending, points | 39 | |
| 71 |
| Strength to Weight: Axial, points | 24 to 30 | |
| 6.7 |
| Strength to Weight: Bending, points | 40 to 44 | |
| 20 |
| Thermal Diffusivity, mm2/s | 0.11 to 0.14 | |
| 0.24 |
| Thermal Shock Resistance, points | 44 to 100 | |
| 27 |