7075 Aluminum vs. PBI
7075 aluminum and PBI belong to fundamentally different material chemistries. 7075 aluminum is a metal, while PBI is a polymeric material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 15 material properties with values for both materials. Properties with values for just one material (29, 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 PBI.
Metric UnitsUS Customary Units
Mechanical Properties
Elastic (Young's, Tensile) Modulus, GPa | 70 | |
5.9 |
Elongation at Break, % | 1.8 to 12 | |
3.0 |
Fatigue Strength, MPa | 110 to 190 | |
56 |
Tensile Strength: Ultimate (UTS), MPa | 240 to 590 | |
160 |
Thermal Properties
Maximum Temperature: Mechanical, °C | 200 | |
340 |
Specific Heat Capacity, J/kg-K | 870 | |
930 |
Thermal Conductivity, W/m-K | 130 | |
0.41 |
Thermal Expansion, µm/m-K | 23 | |
23 |
Otherwise Unclassified Properties
Density, g/cm3 | 3.0 | |
1.3 |
Common Calculations
Stiffness to Weight: Axial, points | 13 | |
2.5 |
Stiffness to Weight: Bending, points | 46 | |
46 |
Strength to Weight: Axial, points | 22 to 54 | |
34 |
Strength to Weight: Bending, points | 28 to 52 | |
50 |
Thermal Diffusivity, mm2/s | 50 | |
0.34 |
Thermal Shock Resistance, points | 10 to 25 | |
84 |