This part of EN 755 specifies the mechanical property limits applicable to aluminium and aluminium alloy extruded rod/bar, tube and profile. Temper designations are defined in EN 515. The numerical designation system of alloys is specified in EN 573-1. The chemical symbol based designation system is specified in EN 573-2. The chemical composition limits for these materials are given in EN 573-3. Mechanical property limits are specified for all Class "A" alloys as defined in EN 573-4.