Hong Guang multi-layer complex internal and external layer of nylon used for the PA11 or PA12 materials, intermediate use of polyester-strengthened, made out of the compound. Products meet SAEJ844 B-type standard requirements, in addition to single-layer nylon performance of the various advantages, especially the burst pressure, anti-wear performance of the increase, more reliable product more secure. Wider application in the automotive, the braking system of construction machinery , fuel system piping.