... Material: 95% Alumina, Zirconia Ceramics Application:sealing/airproof ring, water seal ring, water valve/hydrovalve 1)Material:Corundum, mullite, ... alumina, 95%~99% Alumina, Zirconia Ceramics2)Variety: ceramic ring, ceramic cup, ceramic needle/ball/base etc erose part3) ... for health4)Application widely used for seal ring, water seal ring, water valve/hydrovalve ceramic sealing part/ airproof ceramic ...