FleeceBACK KEE HP (High Performance) membrane is durable, tough and versatile, making it ideal for a wide variety of re-roofing and new construction projects. Manufactured using a hot-melt extrusion process for complete scrim encapsulation, FleeceBACK KEE HP membrane offers exceptional weather ability, flexibility, and toughness due to its fiberglass reinforcing scrim, polyester fleece backing, and DuPont® Elvaloy® KEE HP copolymer. Elvaloy KEE HP, a solid plasticizer that won't migrate out of the sheet over time, helps to ensure the membrane remains pliable and weldable as it ages and reduces the amount of smoke generated during the welding process. The fiberglass reinforcing scrim provides the sheet with added dimensional stability for fully adhered applications; the fleece backing enhances the puncture-resistance of the membrane and provides a built-in separation layer against rough concrete decks or existing asphaltic-based roofing systems.