Polyethylene coated cloth with rubber adhesive. Good moisture proofing and duct sealing and general purpose applications. Available in silver color 2 in x 60 yd rolls. Typical physical and performance characteristics include; adhesion to steel: 60 oz/in width, tensile strength: 36 lbs/in width, elongation at break: 8%, thickness: 12.0 mils, temperature use range: up to 200F