99%+ SiO2 High-Silica Glass (IEC 60672 Type G-799)
G-799 high-silica glass is a grade of high-silica glass. The graph bars on the material properties cards below compare G-799 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
800 °C 1470 °F
Thermal Expansion
0.6 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
Electrical Dissipation At 1 MHz
0.00044
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