Quanex Building Products Corporation , a leading supplier of window and door components, today announced that it has acquired HL Plastics , the United Kingdom's fastest-growing vinyl profile extruder, in an all-cash transaction valued at approximately $145M. HL is a world-class vinyl extruder backed by a tradition of innovation and quality, geographic reach across the UK and Ireland, and a new, state-of-the-art vinyl extrusion facility.