Black alumimun oxide abrasive(Lower Aluminum Oxide Abrasive) is a new type abrasive material for polishing various metal works.It is electrical fused in an arc furance from aluminun oxide as raw material. Black aluminum oxide abrasive is featured with high hardness,strong tenacity ,good self-sharpening, better cohesiseness,highet durability ,less heat generated in used in grinding and polishing stainless steel, metal works,opital glass,bamboo or articles. And it is also the new grinding material of producing cocophony grinding wheels,slice,and emery cloth.