Carlisle's Sure-Weld SAT (Self-Adhering Technology) membrane is a heat-weldable single-ply thermoplastic polyolefin (TPO) sheet designed for fully adhered new roof construction and re-roofing applications. Sure-Weld SAT is TPO membrane laminated to an elastomeric pressure-sensitive adhesive. TPO membrane is based on 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 SAT TPO membrane utilizes Carlisle's exclusive LayFlat Technology, a perfect combination of membrane, adhesive and manufacturing expertise that results in the easiest TPO installation.