GPO-3 Channel for electrical applications. GPO-3 (GPO3) U-Channel and Hat Channel perform well in electrical applications that require high arc and carbon track resistance as well as flame resistance, physical strength, and moderate heat resistance. Grade GPO-3 laminate is used extensively in the making of phase and end barriers, insulating supports, bus bar supports and mounting panels in switchgear and other types of electrical apparatus. Grade GPO-3 is a UL recognized product with a temperature index of 120 degrees celsius electrical and 140 degrees celsius mechanical. Also available in specialty grades from Glastic Contact a Professional Plastics customer service representative for more details.