... molybdenum cast iron Lifetime: over 4500 hours hrdness:HRC65-72 duo cone(floating)seal The material of the floating seals is ... a special chrome molybdenum cast iron, the content of chrome is ... .Character: high hardness, wear-resisting, anti-dirty ability, corrosion resistant.Life: over 4500 hoursHRC: 65-72SpecificationsPressure: 1.0-1.7bar/cm2 ...