Dynamic expansion of the Polish domestic production of laminates with the share of biaxially oriented polypropylene films and polyethylene terephtalate films usually interlayer printed and metallized induced the Polish Packaging Research & Development Centre to carry out a wider research concerning the evaluation of the delamination resistance (interlaminar strength) in materials of this type. The testing methods for the delamination resistance contained in various standards and also in testing procedures of the Polish Packaging R. & D. Centre are discussed. The methodology used in the delamination resistance testing of laminates with the share of the PET and PE films metallized and interlayer printed and also with the share besides the PET and PE films of the aluminium foil is characterized.