... 4.reasonable price Alumina ceramic balls:Main chemical composition: AL2O3≥75% Fe2O3≤3% K2O≤1% TiO2 ... cm3)Refractoriness: 1.13%(1000°C heat for 10 minutes)Specification: 10-20 mesh, 20-30 mesh, ... shape;low thermal expansion rate;good resistance for crushing;can be used as neutral material, ... , reduce industry waste discharge and is good for environment protection.small bulk density, reduce production ...