... -0.03mm 2,Porous bronze 0.2-0.3mm 3,Steel backing 0.7-2.3mm 4,Tin palting or copper ... plating 0.008mm INTRODUCTION1,Steel backing,sintered porous bronze, PTFE layer2,Small rubbing coefficient,wear ... the course of movement ,favorable protection forgrinding bearing no grip7,Less requirement for grinding bearing, all the bearings that not hardening and ...