PEEK vs. Lithium Fluoride
PEEK and lithium fluoride belong to fundamentally different material chemistries. PEEK is a polymeric material, while lithium fluoride is ceramic. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 9 material properties with values for both materials. Properties with values for just one material (26, in this case) are not shown.
For each property being compared, the top bar is PEEK and the bottom bar is lithium fluoride.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 1.3 to 1.5 | |
| 2.6 |
| Elastic (Young's, Tensile) Modulus, GPa | 4.0 to 24 | |
| 120 |
| Melting Onset (Solidus), °C | 340 | |
| 870 |
| Specific Heat Capacity, J/kg-K | 1390 to 1700 | |
| 1560 |
| Stiffness to Weight: Axial, points | 1.5 to 10 | |
| 24 |
| Stiffness to Weight: Bending, points | 36 to 73 | |
| 62 |
| Thermal Conductivity, W/m-K | 0.25 to 0.93 | |
| 12 |
| Thermal Diffusivity, mm2/s | 0.1 to 0.51 | |
| 2.9 |
| Thermal Expansion, µm/m-K | 15 to 52 | |
| 32 |