Black aluminium oxide abrasive (Lower Aluminium Oxide Abrasive)is a new type abrasive material for polishing various metal works.It is electrical fused in an are furnace from aluminium oxide as raw material.Black aluminium oxide abrasive is featured with high hardness,strong tenacity, good self-sharpening, better cohesiseness,higher durability,less heat generated in grinding and giving the metal works high finish ,less power weakened in grinding.It is mostly used in grinding and polishing stainless steel,metal works,optical glass,bamboo orarticles.And it is also the new grinding material of producing colophony grinding wheels,slice,and emery cloth.