Magnet wire is used in the manufacture of electrical products in coils or windings of insulated wire, also known as the winding wire, and is usually divided into the wire, around the envelope, paint surrounding the envelope and an inorganic insulating line. Enameled magnet wire is usually divided into the electrically insulating layer with an insulating material and manufacturing methods, wrapping lines, paint surrounding the envelope and an inorganic insulating line. Earliest oily enameled wire, made ​​of tung oil. The film poor wear resistance, can not be directly used in the manufacture of motor coils and windings, need to add the enveloping layer of cotton yarn. Later, polyvinyl formaldehyde enameled wire come out, greatly improved mechanical properties can be used directly in the motor windings, and referred to as high-strength magnet wire. Due to the increasingly widespread application of enameled wire, an increasingly demanding and also developed a composite enameled wire. Its inner and outer film by different polymer materials.

Magnet wire must meet the requirements of a wide range of use and manufacturing processes. On the use of a variety of requirements, including its shape, size, short-term and long-term work at high temperatures, to withstand some occasions, the strong vibration and high speed centrifugal force, a high voltage withstand corona and breakdown, Special atmosphere of resistance to chemical corrosion; subjected to tensile, bending and wear requirements, as well as dipping and drying process swelling, erosion and other requirements in the manufacturing process, including wound and embedded line.