17 Extruded plastics [semi-finished products]; window and door profiles of plastic or predominantly of plastic [semi-finished products], in particular extruded window and door profiles [semi-finished products]; window and door profile combinations of plastic or predominantly of plastic [semi-finished products], in particular combinations of frame and sash profiles [semi-finished products]; insulating material [as far as included in class 17], in particular for ventilation windows or for use in connection with ventilation flaps; connectors and accessories for the aforesaid goods [as far as included in class 17], in particular mullion/frame connectors of plastic