<p>A polymer material consisting of at least two layers, at least one fluorine-containing layer and at least one non-fluorine-containing layer, in which the fluorine-containing layer is 0.01 to 100 mu m thick, contains 0.1 to 0.76 g of fluorine per g of the fluorine-containing layer and coated with 40 mu g/cm<2> to 50 mg/cm<2> fluorine. Use of the polymer materials for the production of tanks, especially for fuel.</p>
