3M 35-PACK Scotch 35 Electrical Tape Packs: 1/2" x 20 ft, Rainbow 35 is 3M 35-PACK # for this tape (they also offer models such as 22, 33+ and 88). 9 different colored rolls come in each pack Carrier/backing: polyvinyl chloride (pvc) film. Adhesive: rubber resin Thickness: 7 mils (carrier, adhesive). elongation: 225 percent Adhesion: 20 ounces per inch (to stainless steel test panel). tensile strength: 17 pounds per inch (longitudinal) Dielectric strength: 8750 volts. Service/operating temperature: 0F to 176F