Patent ID: 6634389
Filing Date: 2003-10-21
Classification: F16L,Y10S

Abstract:
A layered tubing for conveying a vapor or liquid, the layered tubing comprising:an outer layer having an inner and an outer face and a thickness, the outer layer consisting essentially of an extrudable thermoplastic selected from the group including polyanude, thermoplastic elastomers and mixtures of polyamide and thermoplastic elastomers; an intermediate layer connected to the inner face of the outer layer, the intermediate layer consisting essentially of an extrudable melt processible thermoplastic which is chemically dissimilar to the extrudable thermoplastic employed in the outer layer; and an intermediate layer having a thickness less than the thickness of the outer layer, the interior layer bonded to the intermediate layer, the interior layer consisting of an extrudable, melt-processible thermoplastic which is chemically dissimilar to the thermoplastic employed in the intermediate layer; wherein the material employed in the interior, outer and intermediate layers are thermoplastic materials when the tubing is in a use condition.