for thin wheel &organic bonded abrasives
details：
regular brown fused alumina----af10, af20,calcined,heat treated,ceramic coating,silane conating
ceramic corundum----ice cut,buue cut
zirconia alumina—zaf40,zaf25
semi-friable brown fused alumina—asf,heat treated,cramic conating
white fused alumina—waf,swa,ceramic conting
silicon carbide—cf10
sbustandard regular brown fused alumina—af50