High-silica Glass vs. Mullite
High-silica glass belongs to the glass and glass-ceramics classification, while mullite belongs to the oxide-based engineering ceramics. There are 10 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 high-silica glass and the bottom bar is mullite.
Metric UnitsUS Customary Units
Material Properties
| Density, g/cm3 | 2.4 | |
| 2.7 to 3.0 |
| Dielectric Constant (Relative Permittivity) At 1 Hz | 3.8 | |
| 8.0 |
| Dielectric Strength (Breakdown Potential), kV/mm | 34 | |
| 16 to 17 |
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 110 to 170 |
| Electrical Dissipation At 1 MHz | 0.00044 to 0.00088 | |
| 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 | 19 | |
| 22 to 31 |
| Stiffness to Weight: Bending, points | 61 | |
| 58 to 62 |
| Thermal Expansion, µm/m-K | 0.6 to 0.75 | |
| 5.8 |