... seal is chrome molybdenum casting iron. The hardness is HRC65-72, the life time over 4500 ... molybdenum is 1-3 percent. 2,Character: high hardness, wear-resisting, anti-dirty ability, corrosion resistant.3 ... lifetime is more than 4500 hours.4,The hardness is HRC65-72,the working face precision ... ,SpecificationsPressure: 1.0-1.7bar/cm2 (max.)Temperature range: -20-90 DegreeCircumferential speed: 3m/ sec (max ...