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High-silica Glass vs. Alumina-lime-silica Glass

Both high-silica glass and alumina-lime-silica glass are glass and glass-ceramics.

For each property being compared, the top bar is high-silica glass and the bottom bar is alumina-lime-silica glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
90
Flexural Strength, MPa 34
46

Thermal Properties

Glass Transition Temperature, °C 650 to 800
680
Thermal Expansion, µm/m-K 0.6 to 0.75
4.3

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.8
6.5
Dielectric Strength (Breakdown Potential), kV/mm 34
34
Electrical Dissipation At 1 Hz 0.00044 to 0.00087
0.0022
Electrical Dissipation At 1 MHz 0.00044 to 0.00088
0.0026
Electrical Resistivity Order of Magnitude, 10x Ω-m 12
12

Otherwise Unclassified Properties

Density, g/cm3 2.4
2.8

Common Calculations

Stiffness to Weight: Axial, points 19
18
Stiffness to Weight: Bending, points 61
53