CORRUGATED MULTILAYER TUBING HAVING FLUOROPLASTIC LAYERS

摘要

A multilayer tube suitable for use on motor vehicles composed of a cylindrical wall having an outer surface, and an inner surface essentially parallel to the outer surface. The cylindrical wall has a first region having an essentially uniform cross-sectional diameter and a second region which has a cross-sectional diameter differing from the essentially uniform cross-sectional diameter of the first region. The second region has at least one convolution contiguously adjacent to the cylindrical wall of the first region. The cylindrical wall is made up of a thick flexible outer layer having an inner and an outer face, composed of an extrudable melt processible thermoplastic; a thin intermediate bonding layer bonded to the inner face of the thick outer layer, composed of an extrudable melt processible thermoplastic capable of sufficiently permanent laminar adhesion to the outer layer; and an inner hydrocarbon barrier layer bonded to the intermediate bonding layer, composed of an extrudable melt processible thermoplastic which contains a fluoroplastic such as polyvinylidine fluoride, polyvinylfluoride, polychlorotrifluoroethylene, ethylene tetrafluoroethylene copolymers, and mixtures thereof.