For polishing non-ferrous metals, it is recommended to use high-purity aluminum oxide powder that is non-deagglomerated. This powder consists of larger, clustered particles, allowing faster stock removal and controlled abrasion. It is beneficial in removing microscopic deformations or scratches created during the intermediate polishing step. This powder is the preferred choice for polishing samples sensitive to water since it can be used with glycol or hydrocarbon oils.
