The development of automobile demands high heat resistance and durability of rubber hose. The inner rubber layer should have good oil resistance and
the outer rubber layer should have wear resistance, heat resistance and weather resistance. At present, the inner and outer layers of the hose have been
converted from nitrile rubber and Neoprene to hydrogenated nitrile rubber, Hypalon rubber, chlorinated polyethylene rubber and acrylate rubber, and
the reinforcing layer is mainly nylon 66.