Automobile air-conditioning hoses are mainly used to transport liquid or gaseous refrigerants. They can be used in various compressor oils in air-conditioning systems within a temperature range of 30°C to +125C. They have weather resistance, ozone resistance and long-lasting heat resistance. And oil resistance. The hose has a nylon lining, which greatly improves the anti-permeability of the hose and reduces the possibility of the refrigerant destroying the atmospheric ozone layer. There are Galaxy quality (formerly Goodyear) and ordinary after-sales quality, generally five-layer hose, from the inside to the outside: the first layer of CR neoprene, the second layer of PA nylon, which is thinner and acts as a barrier, and the third Layer NBR, nitrile, fourth layer PET, thread, and fifth layer EPDM.