PPG Industries PPG +0.35% has published a flyer with performance data for new SUNGATE(R) 600 glass. The document also details a new insulating glass unit (IGU) technology by PPG that can help window makers achieve R-5 insulating performance with dual-pane window construction. Sungate 600 glass is a passive, low-emissivity glass that is designed to help homes retain furnace and solar heat, especially in cold, northern climates. In a standard 3/4-inch residential IGU, Sungate 600 glass has a winter nighttime U-value of 0.29, along with visible light transmittance (VLT) of 72 percent and a solar heat gain coefficient (SHGC) of 0.70. PPG engineered Sungate 600 glass for use with SOLARBAN(R) solar control, low-e glasses. The data sheet illustrates a dual-pane IGU that incorporates one pane of 3-millimeter Solarban 60 glass on the second (No. 2) surface of the IGU and one 3-millimeter pane of Sungate 600 glass on the fourth (No. 4) surface, separated by a 1/2-inch of argon-filled space. The dual-pane, dual-coat configuration enables the IGU to achieve R-5 (U-value of 0.22 or better) 'center-of-glass insulating' performance. That means window makers can meet new energy-efficiency goals being emphasized by the federal government without incurring the expense and material costs associated with triple-glazed windows.
