Mullite vs. Beryllia
Both mullite and beryllia 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 mullite and the bottom bar is beryllia.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 800 | |
| 1650 |
| Elastic (Young's, Tensile) Modulus, GPa | 110 to 170 | |
| 350 |
| Flexural Strength, MPa | 130 to 160 | |
| 240 |
| Poisson's Ratio | 0.25 | |
| 0.26 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 140 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1680 | |
| 1750 |
| Specific Heat Capacity, J/kg-K | 950 | |
| 1050 |
| Thermal Conductivity, W/m-K | 3.5 to 11 | |
| 270 |
| Thermal Expansion, µm/m-K | 5.8 | |
| 8.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.3 | |
| 6.6 |
| Dielectric Strength (Breakdown Potential), kV/mm | 16 to 17 | |
| 11 |
| Electrical Dissipation At 1 MHz | 0.0025 | |
| 0.00060 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 10 to 11 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 to 3.0 | |
| 2.9 |
Common Calculations
| Stiffness to Weight: Axial, points | 22 to 31 | |
| 67 |
| Stiffness to Weight: Bending, points | 58 to 62 | |
| 82 |
| Strength to Weight: Axial, points | 15 to 17 | |
| 14 |
| Strength to Weight: Bending, points | 22 to 24 | |
| 21 |
| Thermal Diffusivity, mm2/s | 1.4 to 3.7 | |
| 89 |
| Thermal Shock Resistance, points | 12 to 19 | |
| 3.6 |