Synthetic Sapphire vs. Alkali-lime-silica Glass
Synthetic sapphire belongs to the oxide-based engineering ceramics classification, while alkali-lime-silica glass belongs to the glass and glass-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 synthetic sapphire and the bottom bar is alkali-lime-silica glass.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 4.0 | |
| 2.7 |
| Dielectric Strength (Breakdown Potential), kV/mm | 9.9 | |
| 28 |
| Elastic (Young's, Tensile) Modulus, GPa | 450 | |
| 78 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 17 | |
| 10 |
| Flexural Strength, MPa | 1090 | |
| 34 to 170 |
| Stiffness to Weight: Axial, points | 63 | |
| 16 |
| Stiffness to Weight: Bending, points | 64 | |
| 53 |
| Thermal Expansion, µm/m-K | 5.3 | |
| 9.0 |