... material of floating seal is chrome molybdenum casting iron. The hardness is HRC65-72, the life time over 4500 hours 1 ... percent and molybdenum is 1-3 percent. 2,Character: high hardness, wear-resisting, anti-dirty ability, corrosion resistant.3,The lifetime ... is more than 4500 hours.4,The hardness is HRC65-72,the working face precision within 0.015um ...