... temp,electric insulation,measure pumps 2.valve balls for acid,alkali, salt, measure pumps 1.Usage: bearing balls for canner pump, magnetic drive ... deep well pump; bushing bearings for nonmagnetic to hydrofluoric acid.2.Characteristic: resistance to strong acid, strong alkali, salt and gas ... , long life, high hardness, resistance to wear 99.5% Al2O3 balls