DVD / CD Scratch Repair - Polishing Abrasives

Alumina Polishing Abrasives

There are a number of different types of alumina polishing abrasives. These abrasive are classified by there manufacturing process, crystal structure (hardness) and their classification process. The main types of alumina’s produced for polishing are either calicned or polycrystalline alumina. Calcined powders can also be characterized as either fused, platey or levigated (air classified / sized) alumina depending upon the grain shape, purity and classification process. There is a major difference in the performance between calcined and polycrystalline alumina abrasives, especially for the submicron particle sizes. The two common crystal structures are the harder alpha alumina (mohs hardness 9) and the softer gamma crystal structure (mohs hardness 8).

Alumina Slurry / Suspensions