... .Technical Specification:Item TypeMH-1MH-2MH-3Chemical composition, %Al2O320-80Al2O3±SiO2≥90Fe2O3≤1Pore size , μm0.5-3540-100110-1000Porosity, %20-3015 ... ceramic balls are divided into 12 grades by reference to Al2O3 content varied from 25% to 80%, and every more 5 ...