The object of this method is the evaluation of the quality of a surface pretreatment used in the preparation of aluminium or its alloys. This European Standard specifies a floating roller method for the determination of the peel resistance of high strength adhesive bonds between one rigid metallic adherend and one flexible metallic adherend when tested under specified conditions of preparation and testing. NOTE The use of the floating roller produces more constant numerical data than other peel methods, but it should not be expected that the flexible metallic adherend will conform to the surface of the roller.