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The insulation or outer coating used on enamelled round wire is a polymer film (varnish) made from a variety of materials
The resin—usually polyester, polyglass, or polyamide—creates a tough, continuous layer of protection for the wire and allows
many windings in the coil without creating a short circuit.
Various types of varnishes have different characteristics or properties such as: High thermal index (AI) Abrasion resistance
(NY) self-bonding (SB) self-lubricating (SL) enamelled round wire for temperature classes between 105 °C and 240 °C, available in
Guaranteed 20,000-hour life at rated temperature. Magnet wire comes in many sizes and shapes such as
Rectangle, square and circle. Enameled wire with a thermoplastic layer that bonds the coils together is used to create
Self-supporting coils that require no bobbins to fit into tight spaces in a variety of electronic applications.

Enameled copper wire is made of copper conductor and insulating material, and the insulating material mainly includes UEW, PEW
and AIW, temperature classes 130°C, 155°C, 180°C, 200°C, 220°C and 240°C. The color is natural and beautiful.