Electrical breakdown of high-temperature insulation materials can be prevented by using thermoplastic polyimide (TPI), a high-performance polymer.

This is important with the transition to electric vehicles, with polymers that offer higher electrical and thermal properties being sought. To enable faster charging and travel over longer distances, electrical breakdown must be prevented by high-temperature insulation materials.

AURUM is a semicrystalline TPI produced by Mitsui Chemicals, Japan, and sold by Bielgo Group. The product offers excellent thermal stability, high-temperature resistance and robust electrical insulation properties.

Suitable for powder coating, injection moulding and extrusion coating, it has a glass transition temperature (Tg) of 245 C.

Key characteristics of AURUM-coated magnet wires for high-voltage mobility applications include: high temperature resistance; thermal stability over a wide temperature range; excellent electrical insulation properties to prevent electrical breakdown, and ensure the safety and reliability of the system; flexibility, even at high temperatures, allowing for ease of winding during manufacturing; resistance to many chemicals; high dielectric strength and light weight.

TPI-coated magnet wires are a good choice for high-voltage applications of 800 V and above.