... price and high quality 2.Country of origin 3.On-time delivery 4.10 ys experience manufacter 5.quick reply Introduction: 20%-80% ... SiO2≥90Fe2O3≤1Pore size , μm0.5-3540-100110-1000Porosity, %20-3015-2515-25Air permeability m3.cm/m2.h.10Pa0.2 ... to the diameter, such as Φ3,Φ6,Φ8,Φ10,Φ13,Φ16,Φ20,Φ25,Φ30,Φ38,Φ50 and Φ75. The products ... the user's request. Alumina Porous Ceramic Balls With High Quality