7075 Aluminum vs. PEI
7075 aluminum and PEI belong to fundamentally different material chemistries. 7075 aluminum is a metal, while PEI is a polymeric material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 14 material properties with values for both materials. Properties with values for just one material (32, 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 7075 aluminum and the bottom bar is PEI.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 70 | |
| 3.4 to 5.6 |
| Elongation at Break, % | 1.8 to 12 | |
| 3.0 to 34 |
| Tensile Strength: Ultimate (UTS), MPa | 240 to 590 | |
| 110 to 160 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 200 | |
| 170 |
| Specific Heat Capacity, J/kg-K | 870 | |
| 1050 to 1220 |
| Thermal Conductivity, W/m-K | 130 | |
| 0.18 to 0.23 |
| Thermal Expansion, µm/m-K | 23 | |
| 20 to 53 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.0 | |
| 1.3 to 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 1.5 to 2.1 |
| Stiffness to Weight: Bending, points | 46 | |
| 39 |
| Strength to Weight: Axial, points | 22 to 54 | |
| 24 to 30 |
| Strength to Weight: Bending, points | 28 to 52 | |
| 40 to 44 |
| Thermal Diffusivity, mm2/s | 50 | |
| 0.11 to 0.14 |
| Thermal Shock Resistance, points | 10 to 25 | |
| 44 to 100 |