Modern Magnet Wire Typically Uses One To Four Build Thicknesses (In The Case Of Quad-Film Type Wire) Of Polymer Film Insulation, Often Of Two Different Compositions, To Provide A Tough, Continuous Insulating Layer. Magnet Wire Insulating Films Use (In Order Of Accelerating Temperature Range) Polyvinyl Formal (Formvar), Polyurethane, Polyamide, Polyester, Polyester-Polyimide, Polyamide-Polyimide...