High-silica Glass vs. Alkali-lime-silica Glass
Both high-silica glass and alkali-lime-silica glass are glass and glass-ceramics.
For each property being compared, the top bar is high-silica glass and the bottom bar is alkali-lime-silica glass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 78 |
| Flexural Strength, MPa | 34 | |
| 34 to 170 |
Thermal Properties
| Glass Transition Temperature, °C | 650 to 800 | |
| 530 |
| Thermal Expansion, µm/m-K | 0.6 to 0.75 | |
| 9.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 3.8 | |
| 7.1 to 7.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 34 | |
| 28 |
| Electrical Dissipation At 1 Hz | 0.00044 to 0.00087 | |
| 0.022 to 0.052 |
| Electrical Dissipation At 1 MHz | 0.00044 to 0.00088 | |
| 0.0088 to 0.053 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 12 | |
| 10 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.4 | |
| 2.7 |
Common Calculations
| Stiffness to Weight: Axial, points | 19 | |
| 16 |
| Stiffness to Weight: Bending, points | 61 | |
| 53 |