Finally, it shall also be able to be produced simply from inexpensive raw materials. [0019] The term synthetic polymers shall be taken to mean, inter alia, polymer blends, in particular based on polyamides, as are described below by way of example. [0020] Preferably, the tubular material comprises a polymer blend of nylon 6 and 10 to 90% by weight of a copolyamide of hexamethylenediamine, isophtha