High-Silica Glass
High-silica glass is a glass-type material.
The properties of high-silica glass include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare high-silica glass to other glass and glass-ceramics (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Thermal Properties
Glass Transition Temperature
650 to 800 °C 1200 to 1470 °F
Thermal Expansion
0.6 to 0.75 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
3.8
Dielectric Strength (Breakdown Potential)
34 kV/mm 1.3 V/mil
Electrical Dissipation At 1 Hz
0.00044 to 0.00087
Electrical Dissipation At 1 MHz
0.00044 to 0.00088
Electrical Resistivity Order of Magnitude
12 10x Ω-m
Other Material Properties
Density
2.4 g/cm3 150 lb/ft3
Elastic (Young's, Tensile) Modulus
78 GPa 11 x 106 psi
Flexural Strength
34 MPa 5.0 x 103 psi
Common Calculations
Stiffness to Weight: Axial
19 points
Stiffness to Weight: Bending
61 points
Followup Questions
Further Reading
Dictionary of Glass: Materials and Techniques, Charles Bray, 2002
Ceramic and Glass Materials: Structure, Properties and Processing, James F. Shackelford and Robert H. Doremus (editors), 2008
Glass: Mechanics and Technology, Eric Le Bourhis, 2007
Handbook of Optical Materials, Marvin J. Weber, 2003