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Alumina-Lime-Silica Glass (IEC 60672 Type G-400)

Alumina-lime-silica glass is a glass-type material. It has a moderately high density among the glass and glass-ceramics in the database. The graph bars on the material properties cards below compare alumina-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

680 °C 1250 °F

Thermal Expansion

4.3 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


2.8 g/cm3 170 lb/ft3

Elastic (Young's, Tensile) Modulus

90 GPa 13 x 106 psi

Flexural Strength

46 MPa 6.6 x 103 psi

Common Calculations

Stiffness to Weight: Axial

18 points

Stiffness to Weight: Bending

53 points

Followup Questions

Further Reading

Glass: Mechanics and Technology, Eric Le Bourhis, 2007

Handbook of Optical Materials, Marvin J. Weber, 2003

Handbook of Optical Constants of Solids, Edward D. Palik (editor), 1998

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