PEEK vs. Silicon Nitride
PEEK and silicon nitride belong to fundamentally different material chemistries. PEEK is a polymeric material, while silicon nitride is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (22, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is silicon nitride.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 120 to 300 | |
| 600 to 2950 |
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 140 to 310 |
| Flexural Strength, MPa | 150 to 330 | |
| 130 to 810 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 330 | |
| 1000 to 1330 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 720 to 800 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 12 to 31 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 2.5 to 3.2 |
Electrical Properties
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 3.0 to 14 | |
| 11 to 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 2.2 to 3.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 34 to 53 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 65 to 78 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 7.5 to 13 |