the material of floating seal is chrome molybdenum casting iron. The hardness is HRC65-72, the life time over 4500 hours 1,The material of the floating seals is a special chrome molybdenum cast iron, the content of chrome is 15 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 ...