... . The hardness is HRC65-72, the life time over 4500 hours 1,The material of the floating seals is a special ... , anti-dirty ability, corrosion resistant.3,The lifetime is more than 4500 hours.4,The hardness is HRC65-72,the working face precision ... um5,SpecificationsPressure: 1.0-1.7bar/cm2 (max.)Temperature range: -20-90 DegreeCircumferential speed: 3m/ sec (max).6,The size of ...