Lead-alkali-silica Glass vs. Mullite
Lead-alkali-silica glass belongs to the glass and glass-ceramics classification, while mullite belongs to the oxide-based engineering ceramics. There are 9 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 lead-alkali-silica glass and the bottom bar is mullite.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 3.1 | |
| 2.7 to 3.0 |
| Dielectric Constant (Relative Permittivity) At 1 Hz | 7.0 | |
| 8.0 |
| Elastic (Young's, Tensile) Modulus, GPa | 67 | |
| 110 to 170 |
| Electrical Dissipation At 1 MHz | 0.0018 | |
| 0.0025 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 12 | |
| 10 to 11 |
| Flexural Strength, MPa | 34 | |
| 130 to 160 |
| Stiffness to Weight: Axial, points | 12 | |
| 22 to 31 |
| Stiffness to Weight: Bending, points | 43 | |
| 58 to 62 |
| Thermal Expansion, µm/m-K | 9.0 | |
| 5.8 |