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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


Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

12 10x Ω-m

Other Material Properties


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