ArmourBridge 45 Bridge, Deck and Waterproofing Membrane is composed of a tough non-woven reinforced polyester mat strengthened with select glass fiber strands. It is then coated with select SBS polymers and premium asphalt to a superior thickness of approximately 4.5 mm (177 mils). Ceramic coated mineral granules are embedded in the product’s surface to provide protection against abrasion and work traffic. A light micro-perforated film bonded to the underside of the product disappears after heat welding. ArmourBridge 45 Membrane is specifically designed for bridge and deck waterproofing, but also can be used in any heat welded waterproofing application where a rugged, premium membrane is required.