... -resistant and bending-resistant.Applicatitons:1. Used in wind-pressured sand -spraying machine to get rid of the rust by spraying ... ball.2. Widely used for sucking or discharging of water, sand, air, and powders in industry, agriculture, factory, mining and building ... , and they are capable of resistance to sand and water, light, small flexible and wear well. The minimum explosive pressure is fourfold ...