| |
| Physical Properties | Metric | English | Comments |
|---|
| Density | 3.96 g/cc | 0.143 lb/in³ |
| Water Absorption | 0.00 % | 0.00 % |
| a Lattice Constant | 4.7591 Å | 4.7591 Å |
| c Lattice Constant | 12.9894 Å | 12.9894 Å |
| Formula Units/Cell (Z) | 6 | 6 |
| Molecular Weight | 101.961 g/mol | 101.961 g/mol |
| Weibull Modulus | >= 10 | >= 10 |
| |
| Chemical Properties | Metric | English | Comments |
|---|
| Molar Volume | 25.575 cc/mol | 25.575 cc/mol |
| |
| Mechanical Properties | Metric | English | Comments |
|---|
| Hardness, Knoop | 1700 - 2200 | 1700 - 2200 |
| Hardness, Vickers | 1365 | 1365 |
| Vickers Microhardness | 2085 | 2085 |
| Hardness, Mohs | 9.0 | 9.0 |
| Abrasive Hardness | 1000 | 1000 |
| Drilling Hardness | 189000 | 189000 |
| Tensile Strength, Ultimate | 300 MPa | 43500 psi |
| Modulus of Elasticity | 370 GPa | 53700 ksi |
| Flexural Strength | 400 MPa | 58000 psi |
| Compressive Strength | 3000 MPa | 435000 psi |
| | 1900 MPa
@Temperature 1000 °C | 276000 psi
@Temperature 1830 °F |
| Poissons Ratio | 0.22 | 0.22 |
| Fracture Toughness | 4.00 MPa-m½ | 3.64 ksi-in½ |
| Shear Modulus | 150 GPa | 21800 ksi |
| |
| Electrical Properties | Metric | English | Comments |
|---|
| Electrical Resistivity | 1.00e+14 ohm-cm | 1.00e+14 ohm-cm |
 | 2.50e+6 ohm-cm
@Temperature 900 °C | 2.50e+6 ohm-cm
@Temperature 1650 °F |
| Magnetic Susceptibility | -0.0000370 | -0.0000370 |
| | -2.30e-7 | -2.30e-7 |
| Dielectric Constant | 9.9 | 9.9 |
| Dielectric Strength | 10.0 kV/mm | 254 kV/in |
| |
| Thermal Properties | Metric | English | Comments |
|---|
| Heat of Fusion | 1093 J/g | 470.0 BTU/lb |
| Heat of Vaporization | 19380 J/g | 8337 BTU/lb |
| CTE, linear | 0.600 µm/m-°C
@Temperature -173 °C | 0.333 µin/in-°F
@Temperature -279 °F |
| | 3.30 µm/m-°C
@Temperature -73.0 °C | 1.83 µin/in-°F
@Temperature -99.4 °F |
| | 5.50 µm/m-°C
@Temperature 25.0 °C | 3.06 µin/in-°F
@Temperature 77.0 °F |
| | 7.10 µm/m-°C
@Temperature 127 °C | 3.94 µin/in-°F
@Temperature 261 °F |
| | 7.50 µm/m-°C
@Temperature 227 °C | 4.17 µin/in-°F
@Temperature 441 °F |
| | 7.90 µm/m-°C
@Temperature 327 °C | 4.39 µin/in-°F
@Temperature 621 °F |
| | 8.50 µm/m-°C
@Temperature 527 °C | 4.72 µin/in-°F
@Temperature 981 °F |
| | 9.10 µm/m-°C
@Temperature 727 °C | 5.06 µin/in-°F
@Temperature 1340 °F |
| | 9.60 µm/m-°C
@Temperature 927 °C | 5.33 µin/in-°F
@Temperature 1700 °F |
| | 10.1 µm/m-°C
@Temperature 1127 °C | 5.61 µin/in-°F
@Temperature 2061 °F |
| | 10.5 µm/m-°C
@Temperature 1327 °C | 5.83 µin/in-°F
@Temperature 2421 °F |
| Specific Heat Capacity | 0.850 J/g-°C | 0.203 BTU/lb-°F |
| | 0.126 J/g-°C
@Temperature -173 °C | 0.0301 BTU/lb-°F
@Temperature -279 °F |
| | 0.502 J/g-°C
@Temperature -73.0 °C | 0.120 BTU/lb-°F
@Temperature -99.4 °F |
| | 0.753 J/g-°C
@Temperature 25.0 °C | 0.180 BTU/lb-°F
@Temperature 77.0 °F |
| | 0.920 J/g-°C
@Temperature 127 °C | 0.220 BTU/lb-°F
@Temperature 261 °F |
| | 1.046 J/g-°C
@Temperature 227 °C | 0.2500 BTU/lb-°F
@Temperature 441 °F |
| | 1.088 J/g-°C
@Temperature 327 °C | 0.2600 BTU/lb-°F
@Temperature 621 °F |
| | 1.172 J/g-°C
@Temperature 527 °C | 0.2801 BTU/lb-°F
@Temperature 981 °F |
| | 1.216 J/g-°C
@Temperature 727 °C | 0.2906 BTU/lb-°F
@Temperature 1340 °F |
| | 1.238 J/g-°C
@Temperature 927 °C | 0.2959 BTU/lb-°F
@Temperature 1700 °F |
| | 1.247 J/g-°C
@Temperature 1127 °C | 0.2980 BTU/lb-°F
@Temperature 2061 °F |
| | 1.255 J/g-°C
@Temperature 1327 °C | 0.3000 BTU/lb-°F
@Temperature 2421 °F |
| Thermal Conductivity | 30.0 W/m-K | 208 BTU-in/hr-ft²-°F |
| | 6.30 W/m-K
@Temperature 800 °C | 43.7 BTU-in/hr-ft²-°F
@Temperature 1470 °F |
| | 10.5 W/m-K
@Temperature 727 °C | 72.8 BTU-in/hr-ft²-°F
@Temperature 1340 °F |
| | 13.0 W/m-K
@Temperature 527 °C | 89.9 BTU-in/hr-ft²-°F
@Temperature 981 °F |
| | 18.9 W/m-K
@Temperature 327 °C | 131 BTU-in/hr-ft²-°F
@Temperature 621 °F |
| | 24.2 W/m-K
@Temperature 227 °C | 168 BTU-in/hr-ft²-°F
@Temperature 441 °F |
| | 32.3 W/m-K
@Temperature 127 °C | 224 BTU-in/hr-ft²-°F
@Temperature 261 °F |
| | 46.0 W/m-K
@Temperature 25.0 °C | 319 BTU-in/hr-ft²-°F
@Temperature 77.0 °F |
| | 82.0 W/m-K
@Temperature -73.0 °C | 568 BTU-in/hr-ft²-°F
@Temperature -99.4 °F |
| | 449.8 W/m-K
@Temperature -173 °C | 3116 BTU-in/hr-ft²-°F
@Temperature -279 °F |
| Melting Point | 2054 °C | 3729 °F |
| Boiling Point | >= 3000 °C | >= 5430 °F |
| Maximum Service Temperature, Air | 1750 °C | 3180 °F |
| Heat of Formation | -1675.3 kJ/mol | -1675.3 kJ/mol |
| |
| Optical Properties | Metric | English | Comments |
|---|
| Refractive Index | 1.761 | 1.761 |
| | 1.769
@Wavelength 589.3 nm | 1.769
@Wavelength 589.3 nm |
| |
| Component Elements Properties | Metric | English | Comments |
|---|
| Al2O3 | 99.9 % | 99.9 % |
| |
| Descriptive Properties |
|---|
| Color | White |
| Crystal Structure | Rhombohedral |
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