... be used in awful environment and specially condition. The rings and balls made by full ceramic material: Si3N4 ... or ZrO2, as a standard constructure,the cage made by PTFE, generally we also could ... make the cage with GFRPA66-25, PEEK,PI, Phonemic ... 6) Hybrid ceramic bearings: (rings in chrome steel or stainless steel, ball in ceramic of Si3N4 or ZrO2 material) 2012 ...