Hexagonal Boron Nitride vs. Alumina
Hexagonal boron nitride belongs to the non-oxide engineering ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 17 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is hexagonal boron nitride and the bottom bar is alumina.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 21 to 250 | |
| 1920 to 2750 |
| Elastic (Young's, Tensile) Modulus, GPa | 14 to 60 | |
| 220 to 370 |
| Flexural Strength, MPa | 18 to 140 | |
| 260 to 430 |
| Poisson's Ratio | 0.11 | |
| 0.22 to 0.24 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 1030 to 2350 | |
| 650 to 1730 |
| Specific Heat Capacity, J/kg-K | 840 to 1610 | |
| 870 to 940 |
| Thermal Conductivity, W/m-K | 29 to 96 | |
| 14 to 30 |
| Thermal Expansion, µm/m-K | 0.54 to 18 | |
| 6.7 to 8.2 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 MHz | 4.0 to 4.4 | |
| 7.8 to 11 |
| Dielectric Strength (Breakdown Potential), kV/mm | 61 to 200 | |
| 8.9 to 12 |
| Electrical Dissipation At 1 Hz | 0.0017 | |
| 0.00031 to 0.0011 |
| Electrical Dissipation At 1 MHz | 0.00075 to 0.0018 | |
| 0.00049 to 0.0013 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 13 to 15 | |
| 6.2 to 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.9 to 2.1 | |
| 3.4 to 4.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.1 to 18 | |
| 35 to 53 |
| Stiffness to Weight: Bending, points | 42 to 69 | |
| 57 to 62 |
| Thermal Diffusivity, mm2/s | 9.9 to 34 | |
| 3.7 to 10 |