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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


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


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