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95-99% SiO2 High-Silica Glass (IEC 60672 Type G-795)

G-795 high-silica glass is a grade of high-silica glass. The graph bars on the material properties cards below compare G-795 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 °C 1200 °F

Thermal Expansion

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


Electrical Dissipation At 1 MHz


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