Graphite vs. Alumina
Graphite belongs to the non-oxide engineering ceramics classification, while alumina belongs to the 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 graphite and the bottom bar is alumina.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 90 | |
| 1920 to 2750 |
| Elastic (Young's, Tensile) Modulus, GPa | 21 | |
| 220 to 370 |
| Flexural Strength, MPa | 80 | |
| 260 to 430 |
| Tensile Strength: Ultimate (UTS), MPa | 18 | |
| 210 to 290 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 220 | |
| 650 to 1730 |
| Thermal Conductivity, W/m-K | 6.0 | |
| 14 to 30 |
| Thermal Expansion, µm/m-K | 4.9 | |
| 6.7 to 8.2 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.8 | |
| 3.4 to 4.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 6.7 | |
| 35 to 53 |
| Stiffness to Weight: Bending, points | 53 | |
| 57 to 62 |
| Strength to Weight: Axial, points | 2.9 | |
| 14 to 23 |
| Strength to Weight: Bending, points | 8.7 | |
| 19 to 28 |
| Thermal Shock Resistance, points | 12 | |
| 4.9 to 14 |