Thermosetting, rubber adhesive with polyester film backing offers excellent resistance to chemicals, solvents, moisture, abrasion and cut-through. High dielectric strength. Offers good electrical strength for coil applications where space is at a premium. 3M polyester film electrical tape 74 is a general purpose polyester tape with thermosetting rubber adhesive. 0.5 Mil film thickness is thin for coil applications where space is at a premium. Durable tape with high dielectric strength. It can withstand higher-temperature conditions than tapes with acetate cloth backings.