... in China 2.material is SSiC 3.full ceramic bearing 4.we are manufacturer SSiC:Usage: high precision, ... low temp,electric insulation,high precision ballscrew set,valve balls for acid,alkali,salt,measure pumps,flowmeter.Characterisitic:resistance to ... strong alkali,salt and gas of deleterious, especially resistance to hydrofluoric acid,long life,high hardness,resistance to wear. ceramic shaft for pump