Aluminum Oxide[4]

Updated: 2026-10-18

Overview

Aluminum oxide (Al₂O₃), commonly known as alumina, is an inorganic compound widely recognized for its hardness, thermal stability, and chemical resistance. It occurs naturally as corundum and is synthesized for industrial applications. Alumina is a critical material in industries ranging from electronics to construction due to its versatility. It is available in various forms, including powders, granules, and single crystals, each suited for specific uses.

Physical and Chemical Properties

Aluminum oxide is characterized by its high melting point (2072°C) and boiling point (2977°C), making it suitable for high-temperature applications. Its hardness (9 on the Mohs scale) is second only to diamond. The compound is chemically inert, resisting reactions with acids and alkalis under normal conditions. This property, combined with its electrical insulating capabilities, makes it ideal for use in electronics and refractory materials.

Main Applications

Alumina is primarily used in abrasives, such as sandpaper and grinding wheels, due to its hardness. It is also a key component in ceramics, enhancing strength and durability. In the chemical industry, alumina serves as a catalyst or catalyst support. Its electrical insulating properties make it valuable in electronics, including substrates for integrated circuits and insulators in high-voltage equipment.

Safety and Storage

While aluminum oxide is generally non-toxic, fine powders can cause respiratory irritation. Proper ventilation and protective equipment, such as masks, are recommended during handling. Storage conditions should be cool and dry to prevent moisture absorption, which can affect performance in certain applications. Bulk quantities should be stored in sealed containers to minimize exposure to environmental contaminants.

B2B Procurement Guide

When procuring aluminum oxide, purity levels (ranging from 85% to 99.99%) must align with application requirements. Particle size and distribution are critical for processes like polishing or catalysis. Suppliers should provide certificates of analysis (CoA) to verify specifications. Pricing is influenced by purity, form, and order volume, with high-purity grades commanding premium prices. Consider sourcing from manufacturers with ISO certification for quality assurance.