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Toughened Alkali-Lime-Silica Glass (IEC 60672 Type G-120)

Toughened alkali-lime-silica glass is a grade of alkali-lime-silica glass. The graph bars on the material properties cards below compare toughened alkali-lime-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

530 °C 990 °F

Thermal Expansion

9.0 µm/m-K

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz


Dielectric Strength (Breakdown Potential)

28 kV/mm 1.1 V/mil

Electrical Dissipation At 1 Hz


Electrical Dissipation At 1 MHz


Electrical Resistivity Order of Magnitude

10 10x Ω-m

Other Material Properties


2.7 g/cm3 170 lb/ft3

Elastic (Young's, Tensile) Modulus

78 GPa 11 x 106 psi

Flexural Strength

170 MPa 25 x 103 psi

Common Calculations

Stiffness to Weight: Axial

16 points

Stiffness to Weight: Bending

53 points

Followup Questions

Further Reading

Glass: Mechanics and Technology, Eric Le Bourhis, 2007

IEC 60672-3: Ceramic and glass-insulating materials - Part 3: Specifications for individual materials