Alumina vs. Lead-alkali-silica Glass
Alumina belongs to the oxide-based engineering ceramics classification, while lead-alkali-silica glass belongs to the glass and glass-ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is lead-alkali-silica glass.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 3.1 |
| Dielectric Constant (Relative Permittivity) At 1 Hz | 8.0 to 9.0 | |
| 7.0 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 to 370 | |
| 67 |
| Electrical Dissipation At 1 Hz | 0.00031 to 0.0011 | |
| 0.0024 |
| Electrical Dissipation At 1 MHz | 0.00049 to 0.0013 | |
| 0.0018 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 6.2 to 14 | |
| 12 |
| Flexural Strength, MPa | 260 to 430 | |
| 34 |
| Stiffness to Weight: Axial, points | 35 to 53 | |
| 12 |
| Stiffness to Weight: Bending, points | 57 to 62 | |
| 43 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 9.0 |