We can casting impeller categories as following : single channel ,double channel , closed type, opened type ,screw centrifugal , sprial-flow type.the material：WCB WCC,LCC. A890 3A A8905A CF8M,CF3,CF3M,ASTM,A747,CB7-Cu1. the max. Casting weight: 300kg .The number of impeller blades: 45 pieces, and the thickness of the blade is 2.2 millimeters.