Infrared Transmitting Glass vs. Alpha Quartz
Infrared transmitting glass belongs to the glass and glass-ceramics classification, while alpha quartz belongs to the non-glass optical ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is infrared transmitting glass and the bottom bar is alpha quartz.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 4.4 to 4.8 | |
| 2.7 |
| Elastic (Young's, Tensile) Modulus, GPa | 18 to 63 | |
| 91 |
| Poisson's Ratio | 0.28 to 0.3 | |
| 0.13 |
| Refractive Index | 1.8 to 2.1 | |
| 1.6 |
| Specific Heat Capacity, J/kg-K | 360 to 430 | |
| 720 |
| Stiffness to Weight: Axial, points | 2.3 to 7.3 | |
| 19 |
| Stiffness to Weight: Bending, points | 20 to 28 | |
| 57 |
| Thermal Conductivity, W/m-K | 0.0060 to 0.23 | |
| 8.5 |
| Thermal Diffusivity, mm2/s | 0.0029 to 0.14 | |
| 4.4 |
| Thermal Expansion, µm/m-K | 9.0 to 17 | |
| 9.5 |