3M™ Polyurethane Protective Tape 8693 and 8693DL are flame retardant tape constructions made from an exceptionally tough polyurethane elastomer that resists puncture, tearing, and abrasion. These products are 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, these products establish an excellent barrier to fluids and help prevent liquids from causing corrosion of the floor system. 8693 and 8693DL incorporate a specially formulated self-stick pressure sensitive adhesive for fast and easy application. These products are supplied on a 4 mil polyethylene liner (removed during application), protecting the adhesive. In addition, 8693DL is supplied with a top polyester liner used as an aide for wide web applications. The top liner is also removed after installation.