PEEK vs. Steatite
PEEK and steatite belong to fundamentally different material chemistries. PEEK is a polymeric material, while steatite is ceramic. 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 (20, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is steatite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 120 to 300 | |
| 540 to 620 |
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 68 to 120 |
| Flexural Strength, MPa | 150 to 330 | |
| 32 to 150 |
| Tensile Strength: Ultimate (UTS), MPa | 97 to 200 | |
| 60 to 220 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 750 to 1230 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 850 to 860 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 1.8 to 2.5 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 7.0 to 9.0 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 to 14 | |
| 8.0 to 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 1.9 to 2.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 14 to 32 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 52 to 83 |
| Strength to Weight: Axial, points | 20 to 41 | |
| 6.4 to 32 |
| Strength to Weight: Bending, points | 36 to 55 | |
| 13 to 42 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 0.79 to 1.1 |
| Thermal Shock Resistance, points | 34 to 57 | |
| 5.1 to 33 |