... beijing 2. resistance to acid, alkali, high temp, low temp, long life, high hardness, especial resistance to 1.Characteristic: resistance to ... , salt and gas of deleterious. Especially resistance to hydrofluoric acid, long life, high hardness, resistance to wear2.Usage: bearing balls for ... well pump; bushing bearings for nonmagnetic to hydrofluoric acid. silicon carbide sealing ring