Lithium Fluoride vs. PEEK
Lithium fluoride and PEEK belong to fundamentally different material chemistries. Lithium fluoride 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 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 lithium fluoride and the bottom bar is PEEK.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 2.6 | |
| 1.3 to 1.5 |
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 4.0 to 24 |
| Melting Onset (Solidus), °C | 870 | |
| 340 |
| Specific Heat Capacity, J/kg-K | 1560 | |
| 1390 to 1700 |
| Stiffness to Weight: Axial, points | 24 | |
| 1.5 to 10 |
| Stiffness to Weight: Bending, points | 62 | |
| 36 to 73 |
| Thermal Conductivity, W/m-K | 12 | |
| 0.25 to 0.93 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 0.1 to 0.51 |
| Thermal Expansion, µm/m-K | 32 | |
| 15 to 52 |