3M Polyurethane Protective Tape 8657DL is a flame retardant tape made from an exceptionally tough polyurethane elastomer that resists puncture, tearing, and abrasion. This product is uniquely formulated to pass the burn resistance requirements of FAR 25.853 when tested alone or as a covering applied to floor panels such as those noted below. Applied over aircraft floor panels, this product establishes an excellent barrier to fluids and helps prevent liquids from causing corrosion of the floor system. 8657DL incorporates a specially formulated pressure sensitive adhesive for fast and easy application. This product is supplied with a 3 mil polyethylene liner to protect the adhesive, and a 2 mil top polyester liner used as an aide for application. One liner is removed prior to installation, the second removed after, to allow for an easier installation.