... opening ratio:80-90% 4.For metal filtration Ceramic foam filter has the advantages of high porosity, low loss of ... of ceramic foam filters: Alumina foam filter, Silicon carbide foam filter, Zirconia foam filter.Ceramic Foam Filter Characteristics:No.SizeApertureCell-opening ratioFlow velocityFilter capacityKg ... / 20 / 3080~9035 ~ 5024 ~ 36400 ~ 900300 ~ 450 Ceramic Foam Filter -Sic , Alumina,Zirconia