Alumina Oxide ceramic seal faces have good corrosion resistance and the seal faces/rings with high purity alumina is very good. Ceramic alumina oxide seal face/ring was the preferred corrosion resistant material in many mechanical seal services before the introduction of silicon carbide seal faces. there are three grades of ceramic seal faces or rings in our company: 95% aluminium oxide ceramic,99% aluminium oxide ceramic and 99.5% aluminium oxide ceramic.