... 1.manufacture in beijing 2.resistance to high temp,resistance to alkali,acid,long life,high hardness 1.Usage: bearing balls for ... salt, measure pumps, flow meter and deep well pump; bushing bearings for nonmagnetic to hydrofluoric acid. 2.Characteristic: resistance to strong ... gas of deleterious. Especially resistance to hydrofluoric acid, long life, high hardness, resistance to wear ceramic bearings