Abstract: The invention relates to a method of producing a film comprising at least one layer of a polymer selected from among thermoplastic fluoro-polymer and polymers (A). The inventive method consists in using extrusion blow moulding to coextrude the following: a) at least one layer of a thermoplastic fluoro-polymer and at least one layer of polymer (A); or b) at least one layer of a thermoplastic fluoro-polymer containing charges and optionally at least one other fluoro-polymer layer; or c) at least one layer of polymer (A), the layers extruded in a), b) or c) adhering to one another; d) a layer of another thermoplastic polymer (B) such that it forms a layer which is adjacent to the assembly of layers extruded in a), b) or c); e) optionally another layer of (B) which is adjacent to the assembly of layers extruded in a), b) or c) on the side opposite that of the layer extruded in d).