Poly-Thermaleze base coat is a cross-linked, modified polyester. Its top coat is an amide-imide polymer. Rated for 180C usage. Belden heavy-armored Poly-Thermaleze has exceptional ability to resist solvents and abuse in difficult windings. Beldsol magnet wire is a dual insulated magnet wire that combines the excellent dielectric characteristic s of polyurethane and the known toughness and solvent resistance of a nylon overcoat. This wire is rated IEEE tests for 270F usage and will solder without insulation removal at 750F.