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Alkali-Lime-Silica Glass

Alkali-lime-silica glass is a glass-type material.

The properties of alkali-lime-silica glass include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare 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

7.1 to 7.5

Dielectric Strength (Breakdown Potential)

28 kV/mm 1.1 V/mil

Electrical Dissipation At 1 Hz

0.022 to 0.052

Electrical Dissipation At 1 MHz

0.0088 to 0.053

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

34 to 170 MPa 5.0 to 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