This is a specification for a car door made of polyurethane plastics with the following features: Door body of GF/PU combined with an integrated metal support. The outside door panel from the waist line down to the bottom edge of the door is fixed to the door body with an adhesive-bonded joint. A metal support designed as a stiffening frame and a supporting element for fittings. Permanently bonded, form-fitting window combined with multi-purpose window that can be lowered. The costs show that this concept is able to compete with conventional metal solutions.