ER7478 is a high-build, one-part epoxy impregnating resin for VPI and dip-and-bake applications in transformers and armatures, offering superior chemical and moisture resistance, 100% solids, UL recognition, and Class H performance. It features a 10–12 minute gel time, 4–6 hour cure at 150°C, 3500 cps viscosity, 1.10 specific gravity, 90°C glass transition temperature, and dielectric strength up to 3400 volts/mil, with available packaging from 1 gallon pails to 330 gallon totes.