Alumina vs. Potassium Bromide
Alumina belongs to the oxide-based engineering ceramics classification, while potassium bromide belongs to the non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is potassium bromide.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 24 |
| Poisson's Ratio | 0.22 to 0.24 | |
| 0.17 |
Thermal Properties
| Melting Onset (Solidus), °C | 2040 | |
| 730 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 450 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 4.8 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 39 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 7.8 to 11 | |
| 4.9 |
| Electrical Dissipation At 1 MHz | 0.00049 to 0.0013 | |
| 0.00020 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 2.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 4.7 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 35 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 3.9 |