The tape shall perform at a temperature of 266 °F without loss of physical or electrical properties. The adhesive coating shall be smooth and uniform and be free of lumps and bare spots. There shall be no separator between adjacent layers of the roll. 3M epoxy film electrical tape 1 is a 3.5 Mil high dielectric flame retardant tape. Has a flame retardant 2.2 Mil epoxy film backing with excellent handling properties and high dielectric strength. This tape has an acrylic adhesive that is resistant to heat, oxidation, solvents and oils. It is UL 510 flame retardant, temperature rated to 266 °F and is printable.