Mullite vs. Steatite
Both mullite and steatite are oxide-based engineering ceramics. There are 22 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is mullite and the bottom bar is steatite.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 800 | |
| 540 to 620 |
| Elastic (Young's, Tensile) Modulus, GPa | 110 to 170 | |
| 68 to 120 |
| Flexural Strength, MPa | 130 to 160 | |
| 32 to 150 |
| Poisson's Ratio | 0.25 | |
| 0.23 |
| Tensile Strength: Ultimate (UTS), MPa | 160 | |
| 60 to 220 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1680 | |
| 750 to 1230 |
| Maximum Thermal Shock, °C | 170 to 230 | |
| 90 to 160 |
| Specific Heat Capacity, J/kg-K | 950 | |
| 850 to 860 |
| Thermal Conductivity, W/m-K | 3.5 to 11 | |
| 1.8 to 2.5 |
| Thermal Expansion, µm/m-K | 5.8 | |
| 7.0 to 9.0 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 8.0 | |
| 6.0 |
| Dielectric Constant (Relative Permittivity) At 1 MHz | 6.3 | |
| 5.7 to 6.5 |
| Dielectric Strength (Breakdown Potential), kV/mm | 16 to 17 | |
| 7.9 to 16 |
| Electrical Dissipation At 1 MHz | 0.0025 | |
| 0.0010 to 0.0060 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 10 to 11 | |
| 8.0 to 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 to 3.0 | |
| 1.9 to 2.8 |
Common Calculations
| Stiffness to Weight: Axial, points | 22 to 31 | |
| 14 to 32 |
| Stiffness to Weight: Bending, points | 58 to 62 | |
| 52 to 83 |
| Strength to Weight: Axial, points | 15 to 17 | |
| 6.4 to 32 |
| Strength to Weight: Bending, points | 22 to 24 | |
| 13 to 42 |
| Thermal Diffusivity, mm2/s | 1.4 to 3.7 | |
| 0.79 to 1.1 |
| Thermal Shock Resistance, points | 12 to 19 | |
| 5.1 to 33 |