Lithium Fluoride vs. Potassium Chloride
Both lithium fluoride and potassium chloride are non-glass optical ceramics.
For each property being compared, the top bar is lithium fluoride and the bottom bar is potassium chloride.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 120 | |
| 28 |
| Poisson's Ratio | 0.27 | |
| 0.18 |
| Shear Modulus, GPa | 52 | |
| 8.5 |
Thermal Properties
| Melting Onset (Solidus), °C | 870 | |
| 780 |
| Specific Heat Capacity, J/kg-K | 1560 | |
| 690 |
| Thermal Conductivity, W/m-K | 12 | |
| 6.5 |
| Thermal Expansion, µm/m-K | 32 | |
| 36 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 9.0 | |
| 4.6 |
| Electrical Dissipation At 1 MHz | 0.00020 | |
| 0.00010 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.6 | |
| 2.0 |
| Light Transmission Range, µm | 0.12 to 6.5 | |
| 0.21 to 20 |
| Refractive Index | 1.4 | |
| 1.6 |
Common Calculations
| Stiffness to Weight: Axial, points | 24 | |
| 7.7 |
| Stiffness to Weight: Bending, points | 62 | |
| 51 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 4.7 |