Polyester Varnishes and Enamels

Polyester coatings may be applied to wire by either an automated or manual dipping operation and subsequently baked at 150°–205°C. They may be used alone or in conjunction with other compatible wire insulation such as nylon polyamides, Formvar, polyimides, or polyurethanes. Polyester wire coatings are noted for their excellent thermal properties which derive from the stability of the ester linkages, the high cross-linking density, and the symmetry of the para-substituted benzene rings. They qualify for Class A (105°C) through Class 200 (200°C) applications.