the present invention relates to a method for radiation grafting a compound by irradiation , that can be grafted onto a fluoropolymer , so as to prevent destabilization of the fluorinated polymer . said method comprises the following steps : a ) the fluoropolymer is mixed in the melted state thereof with a graftable compound ; b ) the mixture obtained in a ) is converted into films , plates , granulates or powder ; c ) the products from step b ) are subjected to photonic or electronic irradiation in a dose of between 0 . 5 and 15 mrad ; and d ) optionally , the products from step c ) are washed and / or a degassed . according to said method , a stabilizing agent is added to the fluorinated polymer . said stabilizing agent can be an antioxidant , a graftable metal salt , or a combination of the two . the invention also relates to structures comprising at least one layer of said mixtures and at least one layer of another material , and to the use of said structures to obtain a barrier effect . said structures act as a barrier to a plurality of fluids , especially to petrol and to air - conditioning fluids , and can take the form of bottles , tanks , containers , pipes , and all kinds of recipients . they can also be transformed into films used to produce packaging .