AXEL TOPSEAL 109 is a single-ply thermoplastic polyolefin roofing waterproofing membrane commonly used in commercial and residential buildings. TPO membranes are made from a blend of polypropylene (PP) and ethylene-propylene rubber (EPR) polymers with advanced polymerization technology, adding antioxidants and anti-aging agent. It is well known for their excellent weather resistance, durability and flexibility.