Alumina vs. Grade A Lava
Both alumina and grade A lava are oxide-based engineering ceramics. There are 13 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.
For each property being compared, the top bar is alumina and the bottom bar is grade A lava.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1920 to 2750 | |
| 76 to 170 |
| Flexural Strength, MPa | 260 to 430 | |
| 28 to 69 |
| Tensile Strength: Ultimate (UTS), MPa | 210 to 290 | |
| 6.9 to 21 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 650 to 1730 | |
| 650 to 1130 |
| Specific Heat Capacity, J/kg-K | 870 to 940 | |
| 840 |
| Thermal Conductivity, W/m-K | 14 to 30 | |
| 2.0 |
| Thermal Expansion, µm/m-K | 6.7 to 8.2 | |
| 2.5 to 3.3 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 7.8 to 11 | |
| 5.3 to 5.8 |
| Dielectric Strength (Breakdown Potential), kV/mm | 8.9 to 12 | |
| 3.2 to 3.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 3.4 to 4.1 | |
| 2.3 to 2.5 |
Common Calculations
| Strength to Weight: Axial, points | 14 to 23 | |
| 0.77 to 2.5 |
| Strength to Weight: Bending, points | 19 to 28 | |
| 3.2 to 7.3 |
| Thermal Diffusivity, mm2/s | 3.7 to 10 | |
| 1.0 |