Lead-Alkali-Silica Glass (IEC 60672 Type G-500)
Lead-alkali-silica glass is a glass-type material. It has a fairly high density among the glass and glass-ceramics in the database. The graph bars on the material properties cards below compare lead-alkali-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
450 °C 840 °F
Thermal Expansion
9.0 µm/m-K
Electrical Properties
Dielectric Constant (Relative Permittivity) At 1 Hz
7.0
Electrical Dissipation At 1 Hz
0.0024
Electrical Dissipation At 1 MHz
0.0018
Electrical Resistivity Order of Magnitude
12 10x Ω-m
Other Material Properties
Density
3.1 g/cm3 200 lb/ft3
Elastic (Young's, Tensile) Modulus
67 GPa 9.7 x 106 psi
Flexural Strength
34 MPa 5.0 x 103 psi
Common Calculations
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
43 points
Followup Questions
Further Reading
Glass: Mechanics and Technology, Eric Le Bourhis, 2007
Handbook of Optical Materials, Marvin J. Weber, 2003
IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials