1.1 This specification covers flexible sheet made from ketone ethylene ester (KEE) as the primary polymer intended for use in single ply roofing membrane exposed to the weather. The sheet shall be reinforced with fabric. This specification covers flexible sheet made from ketone ethylene ester (KEE) as the primary polymer intended for use in single ply roofing membrane exposed to the weather. The sheet shall be reinforced with fabric. The sheet shall be formulated from