Aluminum oxide CAS：1344-28-1
Thermal Stability and Properties：With a melting point of 2040°C and a boiling point of 2980°C, alumina has outstanding high-temperature resistance, making it widely applicable in high-heat scenarios such as crucible production and abrasive making.
Mechanical Hardness and Crystal Features：Alumina has a Mohs hardness of 8.8, placing it among the hardest engineering materials, which supports its use in precision cutting tools and the production of artificial gemstones.Wide Industrial Uses：Alumina plays a key role in bearing assemblies, high-speed mechanical parts, and corundum crucibles that can endure operating temperatures up to 1800°C in chemical production.
Chemical Stability and Safety Notes：This material is chemically stable and insoluble in water. However, long-term inhalation of its dust may damage the respiratory system, so respiratory protection must be used during operation.
Aluminum oxide, identified by the chemical formula Al₂O₃, is widely referred to as alumina. It appears as a white powder with strong thermal stability, does not dissolve in water, and has fixed physical indexes: melting point 2015°C, boiling point 2980°C, density 4.0, and Mohs hardness 8.8. This substance can crystallize in several different structural types, with α‑alumina and γ‑alumina being the two most common crystal forms.
Product Parameter
| Melting point | 2040 °C(lit.) |
| Boiling point | 2980°C |
| density | 3.97 |
| bulk density | 950-1100g/L |
| vapor pressure | 17 mm Hg ( 20 °C) |
| refractive index | 1.765 |
| Fp | 2980°C |
| storage temp. | Sealed in dry,Room Temperature |
| solubility | Miscible with ethanol. |
| form | powder |
| color | White to pink |
| Specific Gravity | 3.97 |
| Odor | Odorless |
| PH Range | 3.5 - 4.5 |
| PH | 7.0±0.5 ( in H2O) |
| Water Solubility | INSOLUBLE |
| semiconductor properties | <0001> |
| Crystal Structure | Trigonal |
| crystal system | Three sides |
| Merck | 14,356 |
| Space group | R3c |
| Lattice constant | a/nmb/nmc/nmα/oβ/oγ/oV/nm30.475890.475891.299190901200.2548 |
| Exposure limits | ACGIH: TWA 1 mg/m3 |
| OSHA: TWA 15 mg/m3; TWA 5 mg/m3 | |
| Dielectric constant | 4.5（Ambient） |
| InChIKey | PNEYBMLMFCGWSK-UHFFFAOYSA-N |
| CAS DataBase Reference | 1344-28-1(CAS DataBase Reference) |
| NIST Chemistry Reference | Aluminum oxide(1344-28-1) |
| EPA Substance Registry System | Alumina (1344-28-1) |
Safety Information
| Hazard Codes | Xi,F |
| Risk Statements | 36/37/38-67-36/38-11-36 |
| Safety Statements | 26-24/25-16-7-36 |
| RTECS | BD1200000 |
| F | 3 |
| TSCA | Yes |
| HazardClass | 8 |
| HS Code | 28181010 |
| Hazardous Substances Data | 1344-28-1(Hazardous Substances Data) |
| Toxicity | Chronic inhalation of Al2O3 dusts may cause lung damage. |
