Overview
Alumina, or aluminum oxide (Al₂O₃), is a widely used industrial chemical known for its hardness and thermal stability. It occurs naturally as corundum and is synthesized for various applications. As a key material in ceramics and refractories, alumina is valued for its resistance to high temperatures and chemical inertness. Its synthetic forms are tailored for specific industrial needs, ranging from abrasive powders to advanced ceramic components.
Physical and Chemical Properties
Alumina is a white crystalline solid with a high melting point of 2072°C and a density of 3.95-4.1 g/cm³. It is insoluble in water and most solvents, making it highly stable. Its exceptional hardness, second only to diamond, and its electrical insulating properties make it suitable for demanding applications. The material is also chemically inert, resisting attacks from acids and alkalis under normal conditions.
Main Applications
Alumina is extensively used in the production of ceramics, including tiles, insulators, and biomedical implants. Its hardness makes it ideal for abrasives like sandpaper and grinding wheels. In the refractory industry, alumina linings withstand extreme temperatures in furnaces and kilns. It also serves as a catalyst support in chemical processes and as a filler in plastics and composites.
Safety and Storage
While alumina is generally non-toxic, prolonged exposure to dust can cause respiratory irritation. Proper ventilation and protective gear, such as masks and gloves, are recommended. Store alumina in a dry, cool environment to prevent moisture absorption. Containers should be sealed tightly to avoid contamination and degradation of material properties.
B2B Procurement Guide
When procuring alumina, prioritize suppliers who provide detailed specifications, including purity (typically 99.5% or higher) and particle size distribution. Certifications like ISO 9001 ensure quality consistency. Bulk purchases often come with discounts, but verify logistics and storage capabilities. For specialized applications, consider custom formulations or coatings to enhance performance.
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