... and long life 3.resined materials 4.high density carbon bearings 1.We will select the most suitable graphite material for ... material to improve the durability. 4.Therefore, carbon and graphite bearings, pistions, piston rings and sealing rings are normally used in ... Xiang,Laodaohe Town,Kaifu District, Changsha City,Hunan,China carbon bearings, carbon products, bearing