... making other non-standard grinding media Products Grade, density, wearing rate and appearanceparameters shown as below Product category Performance ... good roundness, minor variegations allowed, no water absorption, Qualified product≥ 5.95≤ 5 No cracking, average roundness, minor ... variegations allowed, no water absorption Ceria Grinding mediaSuperior product≥ 6.2≤ 10 No cracking, no breakdowns and ...