Pulseshield SD is Rea's patented (US patent number 6056995) and UL approved magnet wire specifically designed for inverter-duty Motors. It is based on Rea's Super Hyslik 200 adding a shield coat of oxide-based insulation to neutralize the damage caused by the voltage stresses introduced by variable speed drives. - The triple film insulation system is composed of THEIC modified polyester, oxide-based shield coat and a polyamideimide (AI) overcoat. The utilization of Rea's pulseshield dramatically increases motor life in inverter-duty applications over standard NEMA MW 35 magnet wire.