Aluminum oxide
CAS Number: 1344-28-1
Chemical Formula: Al2O3
Synonyms: Aluminum Oxide, Neutral, Brockmann Activity Grade I
Appearance: White powder
HS Code: 2818200000
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
Aluminum oxide, often referred to as alumina, features the chemical formula Al₂O₃ and appears as a white powder. It is heat-resistant and does not dissolve in water. Key physical properties include a melting point of 2015℃, boiling point of 2980℃, relative density of 4.0, and Mohs hardness of 8.8. It exists in multiple crystalline forms, with α‑alumina and γ‑alumina being the most common. Alumina is typically produced by heating and dehydrating aluminum hydroxide.
Naturally occurring α‑alumina is known as corundum, ranking second only to diamond in hardness. Trace impurities can create colored gemstones: rubies contain small amounts of Cr³⁺, while sapphires include Ti³⁺, Fe²⁺, and Fe³⁺. Today, synthetic gemstones can be manufactured via crystallization from molten aluminum oxide. These synthetic gems match natural ones in performance and are widely used in industry—for example, as high‑speed bearings, watch jewels, abrasives, and refractories. Corundum crucibles made from alumina can resist temperatures up to 1800℃.
Parameters
| Parameter | Value |
| 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
| Item | Details |
| Hazard Codes | Xi,F |
| Risk Statements | 36/37/38-67-36/38-11-36 |
| Safety Statements | 26-24/25-16-7-36 |
| WGK Germany | – |
| 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. |
Product Classification & Applications
Catalysis and inorganic chemistry; other reagents; powders; aluminum; oxides; coating materials; Ct oxides; inorganic chemical products; inorganic salts; Cw inorganic functional materials; catalysts; other petroleum processing catalysts; petroleum processing catalysts; light metals; inorganic compounds and salts; catalysts and additives; desiccants; general reagents; other biochemical reagents; proteomics; ultra-dry solvents; reagents for specific purposes; physical properties; refractory materials; chemical raw materials; chemical reagents; chemical products – organic chemicals; biochemical reagents – other chemical reagents; organic chemical raw materials; chemical industry; conventional oxide powders – alumina; raw materials; oxides – alumina; metal compounds – aluminum salts; biochemical reagents – separation reagents
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Fast delivery time
Inventory: 2–3 working days
New production: 7–10 working days
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