Material: 95% Alumina, Zirconia Ceramics Application:sealing/airproof ring, water seal ring, water valve/hydrovalve 1)Material: ... acid-Bases, thermostability and seismic-resistance, durable and wearable, good sealing propertyThere is no any wear or leakage after 500 thousands ... for seal ring, water seal ring, water valve/hydrovalve ceramic sealing part/ airproof ceramic ring