Alumina ceramic seal faces have the property of the resistant-high-temperature, resistant-corrosion, resistant-wearing and good sealing and are widely used in spacecraft, machinery, metallurgy, printing and dyeing,  foodstuff, pharmaceutical, auto industry and so on.

Tungsten carbide is widely used as seal faces with resistant-wearing, high fractural strength, high thermal conductivity, small heat expansion co-efficient.  It is the best material to resist heat and fracture in all hard face materials.

Silicon Carbide have the property of excellent resistant-corrosion, high mechanical strength, high thermal conductivity, good self-lubrication, used as seal faces, bearings and tubes.  When the sic faces are combined with graphite faces the friction is the smallest and they can be made into mechanical seals which are able to work in highest working requirements.

Graphite has the good property of good resistant-corrosion, high thermal conductivity and lower friction, good self-lubrication, the smaller expansion.   They can be made into the seal faces, bearings and so on. It is ideal to choose it as the frictional mating rings.