1.Resistance to strong acid, strong alkali,salt and gas of deleterious,long life 2.resistance to wear,higher modulus of elasti 1.Usage: bearing balls for canner pump, magnetic drive pump. Vacuum pump, fixed anode X-ray tube shaft; bushing bearing for strong acid, strong alkali, salt, measure pumps, flow meter and deep well pump; bushing bearings for nonmagnetic to hydrofluoric acid.2. ...