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Mullite vs. High-silica Glass

Mullite belongs to the oxide-based engineering ceramics classification, while high-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 (16, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 2.7 to 3.0
2.4
Dielectric Constant (Relative Permittivity) At 1 Hz 8.0
3.8
Dielectric Strength (Breakdown Potential), kV/mm 16 to 17
34
Elastic (Young's, Tensile) Modulus, GPa 110 to 170
78
Electrical Dissipation At 1 MHz 0.0025
0.00044 to 0.00088
Electrical Resistivity Order of Magnitude, 10x Ω-m 10 to 11
12
Flexural Strength, MPa 130 to 160
34
Stiffness to Weight: Axial, points 22 to 31
19
Stiffness to Weight: Bending, points 58 to 62
61
Thermal Expansion, µm/m-K 5.8
0.6 to 0.75