Potassium Chloride vs. Potassium Bromide
Both potassium chloride and potassium bromide are non-glass optical ceramics.
For each property being compared, the top bar is potassium chloride and the bottom bar is potassium bromide.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 28 | |
| 24 |
| Poisson's Ratio | 0.18 | |
| 0.17 |
| Shear Modulus, GPa | 8.5 | |
| 7.0 |
Thermal Properties
| Melting Onset (Solidus), °C | 780 | |
| 730 |
| Specific Heat Capacity, J/kg-K | 690 | |
| 450 |
| Thermal Conductivity, W/m-K | 6.5 | |
| 4.8 |
| Thermal Expansion, µm/m-K | 36 | |
| 39 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 4.6 | |
| 4.9 |
| Electrical Dissipation At 1 MHz | 0.00010 | |
| 0.00020 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.0 | |
| 2.8 |
| Light Transmission Range, µm | 0.21 to 20 | |
| 0.22 to 26 |
| Refractive Index | 1.6 | |
| 1.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 7.7 | |
| 4.7 |
| Stiffness to Weight: Bending, points | 51 | |
| 35 |
| Thermal Diffusivity, mm2/s | 4.7 | |
| 3.9 |