The enameled copper wire is usually used for magnets, speakers, and motors. Instead of a plastic or rubber coating, the wire is only coated with a protective coating, which is usually twice the flux coating. This eliminates the need to strip the wire from the coating before soldering. The type of enamel and its thickness is used to specify a grade of 1, 2, or 3, of which grade 3 is the highest grade of insulation performance. Enamel can be used for both copper and aluminum wires, and round and rectangular wires that are usually used in motor windings can also be used to make full use of the limited space.
As the name implies, polyurethane, polyamide, or polyester resins can be used to coat wires instead of paint. Although this coating is insulating, it usually feels sticky when touched. The coating is resistant to high temperature and high pressure, and the thickness of the wire is directly related to the thickness of the enamel coating applied to it. It is not uncommon for Round Enameled Copper Wire to be used inside transformers due to its high-temperature rating. The coating used on newer wires is a flux-like product that can be soldered without peeling the paint layer.