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Alumina vs. Lead-alkali-silica Glass

Alumina belongs to the oxide-based engineering ceramics classification, while lead-alkali-silica glass belongs to the glass and glass-ceramics. There are 10 material properties with values for both materials. Properties with values for just one material (17, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 3.4 to 4.1
3.1
Dielectric Constant (Relative Permittivity) At 1 Hz 8.0 to 9.0
7.0
Elastic (Young's, Tensile) Modulus, GPa 220 to 370
67
Electrical Dissipation At 1 Hz 0.00031 to 0.0011
0.0024
Electrical Dissipation At 1 MHz 0.00049 to 0.0013
0.0018
Electrical Resistivity Order of Magnitude, 10x Ω-m 6.2 to 14
12
Flexural Strength, MPa 260 to 430
34
Stiffness to Weight: Axial, points 35 to 53
12
Stiffness to Weight: Bending, points 57 to 62
43
Thermal Expansion, µm/m-K 6.7 to 8.2
9.0