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Glass-bonded Mica vs. Alumina

Glass-bonded mica belongs to the glass and glass-ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 270
1920 to 2750
Elastic (Young's, Tensile) Modulus, GPa 71
220 to 370
Flexural Strength, MPa 79
260 to 430
Tensile Strength: Ultimate (UTS), MPa 39
210 to 290

Thermal Properties

Maximum Temperature: Mechanical, °C 450
650 to 1730
Maximum Thermal Shock, °C 110
200 to 300
Specific Heat Capacity, J/kg-K 500
870 to 940
Thermal Conductivity, W/m-K 23
14 to 30
Thermal Expansion, µm/m-K 6.7
6.7 to 8.2

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.8
7.8 to 11
Dielectric Strength (Breakdown Potential), kV/mm 20
8.9 to 12
Electrical Dissipation At 1 MHz 0.0016
0.00049 to 0.0013
Electrical Resistivity Order of Magnitude, 10x Ω-m 10
6.2 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.6
3.4 to 4.1

Common Calculations

Stiffness to Weight: Axial, points 15
35 to 53
Stiffness to Weight: Bending, points 52
57 to 62
Strength to Weight: Axial, points 4.1
14 to 23
Strength to Weight: Bending, points 9.7
19 to 28
Thermal Diffusivity, mm2/s 18
3.7 to 10
Thermal Shock Resistance, points 5.9
4.9 to 14