Metal-plastic composites are promising components for lightweight constructions. The paper deals with metal-plastic composites with an elastic interface layer of polyurethane with different thicknesses. The introduction of such a plane and adhesively bonded elastic interface layer enables the production composites of metals and thermoplastics with very high bond strength. The composites are made by compression moulding, injection moulding or by sandwich injection moulding. The bond strength was characterized by a shear test.