Magnet Wire Insulation Guide

Operating at 105 degrees, the electromagnetic wire can be selected from standard enamel, one of the first automotive ignition insulation materials, and today is mainly used in musical instrument coils, which are generally 41 to 44 gauge in size. Formvar insulation is another major option. It is a natural insulation made of modified polyethylene resin that wears well and can be mixed with other varnishes and compounds. A further insulating material is Formvar combined with thermoplastic film insulation enamels, which better activate the electromagnetic wire coil.

In the working environment of 130 degrees, the enamel of electromagnetic wire is composed of weldable polyurethane and thermoplastic plastic film. At this temperature, it is the best choice.
There are many choices of enamel for electromagnetic wires at 155 degrees, and the insulating film of polyurethane resin is the best choice for thin electromagnetic wires. The enamel composed of polyurethane resin and nylon shell can better cope with the complex electromagnetic coil, if the addition of butyral film on the basis of the two can meet the high heat resistant environment of the coil. Glass and polyester fibers are also suitable for wear resistance as choices for electromagnetic wire enamels.

At a high temperature of 180 degrees, polyurethane enamels are specially prepared for electromagnetic wires with high thermal resistance and low temperature welding requirements. If covered with nylon coating on the basis of polyurethane enamels, the work needs of high thermosetting and chemical corrosion resistance are met. If the enamel of electromagnetic wire only needs to deal with chemical corrosion, the modified polyester enamel can also be competent for this job. The modified polyester resin with nylon fiber double coating is designed for welding at 470 degrees and is usually used at 24 AWG or thinner electromagnetic wire, which has high performance and low friction coefficient compared to other enamels. And the thicker electromagnetic wire is suitable for polyimide resin and nylon fiber combination of double enamel. The combination of a double layer polyurethane or nylon fiber coating with a hot plastic film can meet the needs of high thermal resistance, solderability and self-adhesive properties. Polyester glass fiber after high temperature varnish treatment can only be used as a circular electromagnetic wire.

At 200 degrees, modified polyester resin is still the preferred enamel for fine electromagnetic wires. The double layer polyester – amide – imide coating can meet the outdoor work requirements such as wind resistance and thermal shock resistance. Composed of modified polyester, corona resistant shielding and a polyaminated diamimide coating, the triple insulating enamel is designed to withstand severe voltages and it is suitable for use in heavy construction with 12 to 24 AWG electromagnetic wires.
At a maximum temperature of 240 degrees, polyimide insulating enamels have excellent conductivity and chemical resistance as the only choice for electromagnetic wires.