Alumina vs. Infrared Transmitting Glass
Alumina belongs to the oxide-based engineering ceramics classification, while infrared transmitting glass belongs to the glass and glass-ceramics. There are 10 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 infrared transmitting glass.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 4.4 to 4.8 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 18 to 63 |
| Flexural Strength, MPa | 260 to 430 | |
| 20 to 79 |
| Poisson's Ratio | 0.22 to 0.24 | |
| 0.28 to 0.3 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 360 to 430 |
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 2.3 to 7.3 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 20 to 28 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 0.0060 to 0.23 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 0.0029 to 0.14 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 9.0 to 17 |