... 2.Bore density: 20, 30, 40, 50 PPi, etc. 3.Size: 380x380mm, 408x408mm, 435x435mm, etc. Ceramic Foam Filter Plate Ceramic foam filters are ... used in the field of aluminum melting and casting Bore density: 20, 30, 40, 50 PPi, etc.Size: 380x380mm, 408x408mm, 435x435mm ... ,Wujiang Longma Aluminum Co., Ltd8,Interthai Manufacturing Co., Ltd Ceramic Foam Filter Plate