January 17, 2008 - He said he's been fielding lots of inquiries from car designers about polycarbonate, the use of which is limited mainly by safety testing requirements. The plastics technology in the MKT involves "upcycled" plastics materials — recycled soft drink bottles and other waste materials. While the use of plastics is obvious in any vehicle's interior, the exterior use of plastics is less obvious but increasingly attractive, he said.