The increased electrification of aircraft involves a necessary increase in operating voltages. This has consequences for the electrical insulation of equipment subject to higher partial discharge stresses. Auxel is an industrial company - subsidiary of the AMPHENOL group - specialising in laminated busbars for power electronics. As a leader of a European Horizon 2020 CleanSky project [1], it has developed a new electrical insulation technology (V.I.L.B) particularly well adapted to SiC circuit busbars. The VILB technology is based on the deposition of multiple thin layers of a solvent-free, UV-crosslinked varnish. It offers unprecedented performance in terms of temperature resistance and reduction of partial discharges, all in a favourable economic and ecological context. Due to good coating on the edges, it is less sensitive to partial discharges and suitable for high voltage applications. The VILB technology is already mature (TRL6) and has great potential for improvement. In particular, the addition of inorganic fillers which can reinforce its thermal and electrical resistance