The present invention relates to the use for storing or transporting chemicals of a structure comprising an inner layer in contact with the fluid to be stored or transported, consisting of a fluoropolymer onto which an unsaturated monomer has been grafted by irradiation and, directly attached to the latter, a polyolefin outer layer. According to a variant, the structure comprises a fluoropolymer, preferably PDVF, layer placed beside the radiation-grafted fluoropolymer. The invention also relates to a structure having a central layer consisting of a radiation-grafted fluoropolymer and, directly attached to the latter, a polyolefin outer layer and a polyolefin inner layer. The polyolefin inner layer is the layer in contact with the chemicals. According to a variant, the radiation-grafted fluoropolymer layer is replaced with a layer of a blend of a fluoropolymer, preferably PVDF, and of a radiation-grafted fluoropolymer.