PEEK vs. 358.0 Aluminum
PEEK and 358.0 aluminum belong to fundamentally different material chemistries. PEEK is a polymeric material, while 358.0 aluminum is a metal. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 16 material properties with values for both materials. Properties with values for just one material (27, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is 358.0 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 71 |
| Elongation at Break, % | 1.6 to 43 | |
| 3.5 to 6.0 |
| Shear Strength, MPa | 50 to 100 | |
| 300 to 320 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 350 to 370 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 170 |
| Melting Onset (Solidus), °C | 340 | |
| 560 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 900 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 150 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 21 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 2.6 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 15 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 53 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 37 to 39 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 42 to 44 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 63 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 16 to 17 |