AL Stone – Alumina
AL Stone is composed of pure synthetic alumina mainly which is made by chemical synthesis and AI2 O3, Cr, Na2 O3, MgO, etc. are combined. These materials are heated at high temperature (1,600˚C – 1,700˚C) to be hardened fused crystal (d-AI2O3). Comparatively the specific gravity of AL Stone (3.0 – 3.6) is rather heavy among barrel stones which property shows excellent grinding efficiency. AL Stone is a stable all round stone and of wide application from heavy job to finishing. Since the hardness is very hard, AL Stone is the most suitable in high speed barrel grinding.