Alpha Quartz vs. Low Expansion Glass-ceramic
Alpha quartz belongs to the non-glass optical ceramics classification, while low expansion glass-ceramic belongs to the glass and glass-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 alpha quartz and the bottom bar is low expansion glass-ceramic.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 91 | |
| 83 |
| Knoop Hardness | 740 | |
| 530 |
| Poisson's Ratio | 0.13 | |
| 0.22 |
Thermal Properties
| Specific Heat Capacity, J/kg-K | 720 | |
| 800 |
| Thermal Conductivity, W/m-K | 8.5 | |
| 1.5 |
| Thermal Expansion, µm/m-K | 9.5 | |
| 1.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 | |
| 2.4 |
| Light Transmission Range, µm | 0.13 to 3.4 | |
| 0.5 to 2.7 |
| Refractive Index | 1.6 | |
| 1.5 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 19 |
| Stiffness to Weight: Bending, points | 57 | |
| 59 |
| Thermal Diffusivity, mm2/s | 4.4 | |
| 0.76 |