Enamelled round copper wire 1. Size: 0.025mm-2.0mm 2. Thermal Class: 130- ... thin layer of a polyurethane, polyamide, or polyester etc. resin - the so-called "enamel". Aluminium is lighter than copper, but has higher resistivity ... , d) high cut through3.Main Applications: This kind of polyurethane enameled copper wire can be widely used in relays, transformers,micro-motor,air ...