Poly-Thermaleze — A magnet wire for Class A, Class B and Class F Applications

In the last three decades many new synthetic organic resins have come from the research laboratories of our chemical industry. When these are applied as an insulating film on a copper wire, and subjected to the many evaluation tests of the magnet wire industry, we can learn much about their fundamental properties. An insulated magnet wire to be used successfully for winding electrical equipment - must have an unusual combination of physical, chemical, thermal and electrical properties. The film insulation on copper magnet wire must be very flexible, and have good abrasion resistance for winding. It must be chemically stable and must have good solvent resistance. Thermally, it must maintain electrical properties against time and temperature for the designed life of the apparatus: and it must physically have good form stability at the extremes of temperature encountered. Electrically, it must have a high dielectric strength and maintain this electrical strength under the environmental conditions of service. In our judgment, the application of a synthetic resin as a film on copper magnet wire permits a better evaluation of synthetic resin properties than any other method in use in industry today.