... Rod 1) steel backing, sintered porous bronze, PTFE layer 2) oil less,self-lubricating 3) low wear,low friction Bearing Bushing ... PTFE on its surface.2, The color of DU bushing's inner layer is black. DU bushing has good wear and ... limit (Dry) 3.8N/mm2 m/sPV limit (Oil ) 60N/mm2 m/s Specification: All sizes are available, please feel free to ...