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High-silica Glass vs. Alumina

High-silica glass belongs to the glass and glass-ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 78
220 to 370
Flexural Strength, MPa 34
260 to 430

Thermal Properties

Thermal Expansion, µm/m-K 0.6 to 0.75
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz 3.8
8.0 to 9.0
Dielectric Strength (Breakdown Potential), kV/mm 34
8.9 to 12
Electrical Dissipation At 1 Hz 0.00044 to 0.00087
0.00031 to 0.0011
Electrical Dissipation At 1 MHz 0.00044 to 0.00088
0.00049 to 0.0013
Electrical Resistivity Order of Magnitude, 10x Ω-m 12
6.2 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.4
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 19
35 to 53
Stiffness to Weight: Bending, points 61
57 to 62