GLASS COMBINES ENERGY AND AESTHETICS PPG Industries has combined the solar control of Solarban 80 low-emissivity glass with its new blue-green Optiblue glass. The combination creates an architectural glass that has a metallic-gray-green exterior tint and neutral-gray interior appearance. In a standard 1-inch (25-mm) insulating glass unit, it produces a solar-heat-gain coefficient of 0.23 and visible light transmittance of 34 percent. (888) 774-4332 /