Alumina vs. High-silica Glass
Alumina belongs to the oxide-based engineering ceramics classification, while high-silica glass belongs to the glass and glass-ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is high-silica glass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 78 |
| Flexural Strength, MPa | 260 to 430 | |
| 34 |
Thermal Properties
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 0.6 to 0.75 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 8.0 to 9.0 | |
| 3.8 |
| Dielectric Strength (Breakdown Potential), kV/mm | 8.9 to 12 | |
| 34 |
| Electrical Dissipation At 1 Hz | 0.00031 to 0.0011 | |
| 0.00044 to 0.00087 |
| Electrical Dissipation At 1 MHz | 0.00049 to 0.0013 | |
| 0.00044 to 0.00088 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 6.2 to 14 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 2.4 |
Common Calculations
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 19 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 61 |