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Beryllia vs. Mullite

Both beryllia and mullite are oxide-based engineering ceramics. There are 20 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is beryllia and the bottom bar is mullite.

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 1650
800
Elastic (Young's, Tensile) Modulus, GPa 350
110 to 170
Flexural Strength, MPa 240
130 to 160
Poisson's Ratio 0.26
0.25
Tensile Strength: Ultimate (UTS), MPa 140
160

Thermal Properties

Maximum Temperature: Mechanical, °C 1750
1680
Specific Heat Capacity, J/kg-K 1050
950
Thermal Conductivity, W/m-K 270
3.5 to 11
Thermal Expansion, µm/m-K 8.0
5.8

Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 MHz 6.6
6.3
Dielectric Strength (Breakdown Potential), kV/mm 11
16 to 17
Electrical Dissipation At 1 MHz 0.00060
0.0025
Electrical Resistivity Order of Magnitude, 10x Ω-m 13
10 to 11

Otherwise Unclassified Properties

Density, g/cm3 2.9
2.7 to 3.0

Common Calculations

Stiffness to Weight: Axial, points 67
22 to 31
Stiffness to Weight: Bending, points 82
58 to 62
Strength to Weight: Axial, points 14
15 to 17
Strength to Weight: Bending, points 21
22 to 24
Thermal Diffusivity, mm2/s 89
1.4 to 3.7
Thermal Shock Resistance, points 3.6
12 to 19