Abstract: The invention relates to a multilayer tube product comprising inner and outer plastic, or polymer, layers and an intermediate metallic layer characterized in that the intermediate metallic layer comprises an aluminium sheet having the composition (values in weight %): Si 1.5 to 4% Mg 0.3 to 3.0% Mn up to 1.5% Fe up to 1.0% Cu up to 0.5% Zn up to 0.3% other elements up to 0.05% each and up to 0.2% in total remainder aluminium The invention also relates to a multilayer tube wherein the intermediate metallic layer comprises a clad aluminium sheet having a core layer of this composition and the at least one clad layer is selected from the alloy compositions of the 1XXX, 3XXX or 7XXX series alloys.