Shurtape PC-618 Industrial Grade Duct Tape: 2 in. x 60 yds. (Burgundy) Carrier/backing: polyethylene film with a polyester/cotton blend cloth carrier. Adhesive: natural rubber Tensile strength: 27 pounds per inch (longitudinal). adhesion: 55 ounces per inch (to stainless steel test panel) Thickness: 10 mils (carrier, adhesive). elongation: 17 percent Flame spread index: 15. Smoke development index: 25 Service/operating temperature: 50F to 200F