The PVC with DuPont Elvaloy Kee Polymer uses the optimal amount of DuPont Elvaloy KEE (Ketone Ethylene Ester) polymer to: ensure plasticizer retention; extend roof life; and to reduce maintenance costs. The Aramid fiber is woven into the fastening side of all full rolls of PVC membrane. Our fully integrated manufacturing process adds tensile strength and toughness. JM PVC is inherently resistant to oils, air conditioning coolants, fuels and grease. Due to the non-wicking edge, sealant is not required.