Unsaturation Polyester Glass Mat Laminated Sheet (GPO3 sheet) is made of several layers glass mat impregnated with unsaturation polyester resin by processing under heat and pressure, GPO-3 laminate performs 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. (IEC: UPGM203; NEMA: GPO-3; DIN7735: HP 2471)