1.for shot and polishing 2.10-220# 3.shot steel 4.surface treatment Function:Black Alundum sandblaster media is made from high quality bauxite by fusing in an electric arc furnace at high temperature., It is brown ,has good toughness and high hardness. It is suitable for manufacturing of vitrified and tool, and for lapping, polishing and blasting. It can be also used to make superior refractory ...