Infrared Transmitting Glass vs. Silicon Nitride
Infrared transmitting glass belongs to the glass and glass-ceramics classification, while silicon nitride belongs to the non-oxide engineering ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is infrared transmitting glass and the bottom bar is silicon nitride.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 4.4 to 4.8 | |
| 2.2 to 3.4 |
| Elastic (Young's, Tensile) Modulus, GPa | 18 to 63 | |
| 140 to 310 |
| Flexural Strength, MPa | 20 to 79 | |
| 130 to 810 |
| Poisson's Ratio | 0.28 to 0.3 | |
| 0.24 to 0.27 |
| Specific Heat Capacity, J/kg-K | 360 to 430 | |
| 720 to 800 |
| Stiffness to Weight: Axial, points | 2.3 to 7.3 | |
| 34 to 53 |
| Stiffness to Weight: Bending, points | 20 to 28 | |
| 65 to 78 |
| Thermal Conductivity, W/m-K | 0.0060 to 0.23 | |
| 12 to 31 |
| Thermal Diffusivity, mm2/s | 0.0029 to 0.14 | |
| 7.5 to 13 |
| Thermal Expansion, µm/m-K | 9.0 to 17 | |
| 2.5 to 3.2 |