... Balls also called filtering balls. It is made by make 20~30% pores inside the inert ceramic balls. Therefore it can ... ≥90Fe2O3≤1Pore size , μm0.5-3540-100110-1000Porosity, %20-3015-2515-25Air permeability m3.cm/m2.h.10Pa0.2 ... diameter, such as Φ3,Φ6,Φ8,Φ10,Φ13,Φ16,Φ20,Φ25,Φ30,Φ38,Φ50 and Φ75. The products in other ... and manufactured if to the user's request. 20%-80% alumina content Porous Ceramic Ball