| abstract |
A thermally insulated conduit with at least one inner tube (1), a heat insulation layer (2) based on foamed polyurethane or polyisocyanurate and an outer jacket (4) made of thermoplastic material is described, in which between the heat insulation layer (2) and the outer jacket (4 ) a plastic film (3) is provided. The plastic film (3) consists of several layers (3.1,3.2,3.3), at least one of the layers (3.1) being impermeable to the propellant gas contained in the cells of the foamed polyurethane or polyisocyanurate, and both the layer facing the outer jacket (4) (3.2) is glued to this as well as the layer (3.2) facing the thermal insulation layer (2). |