Pro Tapes P-28/WI07522 P-28 All-Weather Colored Electrical Tape: 3/4" x 66 ft, White Carrier/backing: plasticized polyvinyl chloride (pvc) film. Adhesive: rubber-based Thickness: 7 mils (carrier, adhesive). elongation: 200 percent Tensile strength: 20 pounds per inch (longitudinal). adhesion to steel (oz per inch): 11.7. To 14.3 Dielectric strength: 600 volts Service/operating temperature: up to 221F