Patent ID: 7220916

Claim:
A shock-protected coaxial electric heating cable having a longitudinal central axis with an electric resistance heating conductor located along the longitudinal central axis for generating heat, and insulating sheaths of polytetrafluoroethylene being arranged in a layered structure with respect to each other and with respect to the heating conductor, wherein at least one of the polytetrafluoroethylene sheaths is protected against shock by at least one adjacent insulating layer means made of a melt processable fluoropolymer, the at least one adjacent insulating layer means being in surface contact to the at least one of the polytetrafluoroethylene sheaths for conducting heat to the cable surface and for providing shock protection around the heating cable; wherein the heating cable has no air cushions in the layer structure to reduce heat generated by the electric resistance heating conductor from building up in the cable on its way to the cable surface.