| abstract |
A tube containing the following layers:n n n An outer layer of a molding composition which contains at least 40% by weight of a polyamide whose monomer units contain on average at least 8 C atoms, and a layer of a polypropylene molding composition, in which a) the outer diameter of the tube is in the range of 6 to 20 mm, b) the wall thickness is in the range of 1.0 to 2.0 mm and c) the thickness of the polypropylene layer is 25 to 75% of the wall thickness, is used as a compressed air brake line, which can be produced inexpensively and has a high bursting strength and a good low-temperature impact strength. |