The FiberTite-XT-FB Fleece Back Roll is the most intense thermoplastic membrane available. It has no equal and surpasses the minimum physical property requirements for Ketone Ethylene Ester (KEE) Based Sheet Roofing and incorporates a non-woven polyester felt, heat bonded to the back side of the membrane with a 3 inch selvedge edge for field welding. Seaman Corporation is vertically integrated, which allows complete control over the manufacturing process from the selection of the yarns, to the engineering, knitting and weaving of the base fabrics to the final coating process. Today, FiberTite Roofing Membranes are the result of Seaman Corporation's 60 years of applied fabric engineering and coating technology. Field seaming of the membrane is accomplished by fusing the thermoplastic membrane with conventional hot air welding equipment. All FiberTite Roofing Membranes are constructed using high tenacity/heavy weight yarns to create a base fabric reinforcement to impart superior puncture, tensile and tear resistance properties. The base polyester fabrics are primed with a unique and proprietary adhesive coat that lays the foundation to physically bond the KEE coatings to the "fiber" to maximize seam strength and overall membrane performance. FiberTite-XT-FB Fleece Back Roll is coated on the face with Seaman Corporation's original "KEE" formulation to provide superior hot air welding characteristics, extreme UV resistance, broad chemical resistance and long-term flexibility and reparability for the installed roofing membrane system. The back side of the membrane is coated with a slightly modified version of Seaman Corporation's original KEE compound. Additionally, FiberTite-XT-FB Fleece Back Roll exhibits extreme puncture and tear resistance for the most abusive roof areas as well as the historical fungus, algae and flame resistance that make FiberTite Roofing Systems some of the most sustainable roofing systems available.