Low Expansion Glass-ceramic vs. Alpha Quartz
Low expansion glass-ceramic belongs to the glass and glass-ceramics classification, while alpha quartz belongs to the non-glass optical ceramics. There are 12 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is low expansion glass-ceramic and the bottom bar is alpha quartz.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 83 | |
| 91 |
| Knoop Hardness | 530 | |
| 740 |
| Poisson's Ratio | 0.22 | |
| 0.13 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 800 | |
| 720 |
| Thermal Conductivity, W/m-K | 1.5 | |
| 8.5 |
| Thermal Expansion, µm/m-K | 1.7 | |
| 9.5 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 2.7 |
| Light Transmission Range, µm | 0.5 to 2.7 | |
| 0.13 to 3.4 |
| Refractive Index | 1.5 | |
| 1.6 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 19 |
| Stiffness to Weight: Bending, points | 59 | |
| 57 |
| Thermal Diffusivity, mm2/s | 0.76 | |
| 4.4 |