Tlenek glinu - Tlenek glinu (III) - Al2O3 - Tlenek glinu - Aloksyt - Proszek tlenku glinu - 25 000g

Aluminium Oxide – Al₂O₃

Other Names: Aluminium (III) oxide, Alumina, Aloxide, Aloxite
Chemical Formula: Al₂O₃
Molar Mass: 101.96 g/mol
CAS Number: 1344-28-1
Appearance: White, odorless, fine crystalline or powdery solid
Odor: Odorless

Physical and Chemical Properties

• Density: ~3.95–4.1 g/cm³ (depends on particle size and form)

• Melting Point: ~2072 °C

• Boiling Point: ~2977 °C

• Solubility: Insoluble in water and most solvents; soluble in strong acids and alkalis

• Hardness: ~9 on the Mohs scale (very hard)

• Thermal Conductivity: ~30 W/m·K

• Electrical Properties: Excellent electrical insulator

• Particle Size: Varies by grade (often available in <5 µm, <100 µm, or custom mesh)

Applications

• Ceramics and Refractories: Key component in high-temperature resistant ceramics, crucibles, and insulating bricks

• Abrasives: Used in grinding wheels, polishing agents, sandpapers (especially fused or calcined grades)

• Catalyst Support: Serves as a high-surface-area support in heterogeneous catalysis

• Electronics: Used as an insulating substrate in microelectronics and semiconductors

• Metallurgy: Applied as a flux and in the refining of aluminum via the Hall-Héroult process

• Glass and Surface Treatment: Used as a blasting medium (Alumina grit) for cleaning and finishing

Safety Information

Not classified dangerous under GHS.

Handling and Storage

• Handling: Use in well-ventilated areas. Avoid dust generation. Employ dust control or collection systems where needed

• Storage: Store in a dry, tightly sealed container. Protect from moisture and strong acids/alkalis

Environmental Considerations

Aluminium oxide is not classified as hazardous to the environment but should not be released into watercourses in fine particulate form. Handle and dispose of according to local environmental laws.