WeatherBond PRO PAS membrane is a heat-weldable single ply thermoplastic polyolefin (TPO) sheet designed for fully adhered new roof construction and re-roofing applications. It consists of a reinforced TPO membrane laminated to an elastomeric quick-applied adhesive, and features advanced polymerization technology that combines the durability and weatherability of ethylene-propylene (EP) rubber with the heat weldability of polypropylene. The membrane is specifically formulated for long-term weather resistance without the use of either polymeric or liquid plasticizers. Every roll of WeatherBond PRO PAS TPO membrane utilizes WeatherBond's exclusive Lay-Flat Technology, a perfect combination of membrane, adhesive and manufacturing expertise that results in the easiest TPO installation. The quick-applied adhesive is a 100%-solids, hot-melt adhesive that eliminates VOC and odor concerns typically associated with fully adhered systems. The adhesive is factory-applied to provide uniform thickness, yielding consistent field performance. An uncoated edge is maintained to allow for heat-welded field seams. The release liner is silicon-coated on both sides to provide consistent, easy release from the adhesive even if either side accidentally touches the adhesive again after removal.