Class 180°C polyurethane magnet wire insulation

There has been increased customer interest in a Class 180°C magnet wire insulation which possesses the thermal wire properties of a Class 180°C solderable polyester-imide product (MW 77C), yet which has solderability characteristics of a conventional polyurethane insulation (MW 79, 80). A developed polymeric insulation fulfills this need for the fine wire market. The unique combination of properties of this material make it especially suitable for use in overmolded coils and other applications involving high heat for short periods of time. Additionally, this new product is more “user friendly” from a health hazard standpoint in that it does not contain toluene diisocyanate (TDI), as do conventional polyurethanes. This paper compares the wire test properties of this new insulation product against standard Class 180°C solderable and a standard Class 155°C polyurethane