Low Expansion Glass-ceramic vs. Potassium Bromide
Low expansion glass-ceramic belongs to the glass and glass-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 (11, in this case) are not shown.
For each property being compared, the top bar is low expansion glass-ceramic and the bottom bar is potassium bromide.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 24 |
| Poisson's Ratio | 0.22 | |
| 0.17 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 800 | |
| 450 |
| Thermal Conductivity, W/m-K | 1.5 | |
| 4.8 |
| Thermal Expansion, µm/m-K | 1.7 | |
| 39 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 5.7 | |
| 4.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 2.8 |
| Light Transmission Range, µm | 0.5 to 2.7 | |
| 0.22 to 26 |
| Refractive Index | 1.5 | |
| 1.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 4.7 |
| Stiffness to Weight: Bending, points | 59 | |
| 35 |
| Thermal Diffusivity, mm2/s | 0.76 | |
| 3.9 |