... ,6,10,13,19,25,38,50mm Inert Ceramic Ball of Size 3,6,10,13,19,25,38,50mm XINGFENG Catalyst ... composition Al2O3+SiO2Al2O3Fe2O3MgOK2O+Na2O +CaOOther> 93%17-19%<1%<0.5%<4%<1%Leach able Fe2O3 is less than 0.1 ... ’s hardness (scale)>6.5Acid resistance (%)>99.6Alkali resistance (%)>85 Size available & Crush strength SizeCrush strengthKg/particleKN/particle1/8''(3mm)>35 ...