MarineLubricateRubberBearingshave10Timeslongerservicelifethangeneral hardsurfacerubberbearings.Featureofoil-proofandchemicalresistanceassureitcan workinallkindsofsevereworkingconditionsworkingtemperature:4-71,Speed coverage:5-7500RPM.frictionratio:highspeed<0.02,lowspeed(lowerthan30RPM),Max.friction reading<0.09,RUubbberhardness:HS70±5,ageratio(90cx24h)>0.75