Why are many magnet wires given a topcoat of nylon (polyamide)?
The mechanical properties of nylon are advantageous due to its lubricity and low coefficient of friction. It makes magnet wire more durable and easier for machines and people to handle without damaging the conductor or primary insulation coating. However, nylon is hygroscopic, meaning it can absorb moisture from the surrounding environment, which can lower the dielectric strength of the film insulation.
