Flex membranes coated with DuPont's Elvaloy KEE (ketone ethylene ester) provide state-of-the-art performance for thermoplastic single-ply roofing systems. Flex PVC flexible single-ply roofing membranes are made using special UV inhibitors to provide a proven long-term roofing solution. The Flex TPO thermoplastic single-ply system with advanced polymerization technology combines durability and weatherproof