Scotch(R) Cotton Cloth Tape 380 Natural, 1 in x 60 yd 11.0 mil, 36 per case Bulk An uncoated cotton cloth backing with rubber adhesive. The cotton cloth backing provides high conformability and easy tear. Typical physical and performance characteristics include; adhesion to steel: 40 oz/in width, tensile strength: 44 lbs/in width, elongation at break: 6%, thickness: 11.0 mils, temperature use range: up to 200F (93C) for up to one hour.