TPO Systems – (Thermoplastic Polyolefin) is a single-ply reflective roofing membrane made from polyprophylene and ethylene-propylene rubber polymerized together. TPO is the fastest growing segment in the commercial roofing industry. TPO systems have been available since the late1980s, and have evolved to provide fabric-reinforced sheets and seam strengths three-to-four-times higher than EPDM roofing systems.