Alumina vs. PEEK
Alumina and PEEK belong to fundamentally different material chemistries. Alumina is a ceramic material, while PEEK is polymeric. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 17 material properties with values for both materials. Properties with values for just one material (21, 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 alumina and the bottom bar is PEEK.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1920 to 2750 | |
| 120 to 300 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 4.0 to 24 |
| Flexural Strength, MPa | 260 to 430 | |
| 150 to 330 |
| Tensile Strength: Ultimate (UTS), MPa | 210 to 290 | |
| 97 to 200 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 650 to 1730 | |
| 330 |
| Melting Onset (Solidus), °C | 2040 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 1390 to 1700 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 0.25 to 0.93 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 15 to 52 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 6.2 to 14 | |
| 3.0 to 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 1.3 to 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 1.5 to 10 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 36 to 73 |
| Strength to Weight: Axial, points | 14 to 23 | |
| 20 to 41 |
| Strength to Weight: Bending, points | 19 to 28 | |
| 36 to 55 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 0.1 to 0.51 |
| Thermal Shock Resistance, points | 4.9 to 14 | |
| 34 to 57 |