High-silica Glass vs. Synthetic Sapphire
High-silica glass belongs to the glass and glass-ceramics classification, while synthetic sapphire belongs to the oxide-based engineering ceramics. There are 8 material properties with values for both materials. Properties with values for just one material (21, in this case) are not shown.
For each property being compared, the top bar is high-silica glass and the bottom bar is synthetic sapphire.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 2.4 | |
| 4.0 |
| Dielectric Strength (Breakdown Potential), kV/mm | 34 | |
| 9.9 |
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 450 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 12 | |
| 17 |
| Flexural Strength, MPa | 34 | |
| 1090 |
| Stiffness to Weight: Axial, points | 19 | |
| 63 |
| Stiffness to Weight: Bending, points | 61 | |
| 64 |
| Thermal Expansion, µm/m-K | 0.6 to 0.75 | |
| 5.3 |