Dual Coat Technology



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New dual-coat technology helps dual-pane insulating glass units for residential applications achieve R-5 insulating performance, according to the supplier. From PPG Industries, the IG design incorporates one 3 mm pane of Solarban 70XL glass with the coating on the second (#2) surface of and one 3 mm pane of Sungate 500 glass with the coating on the fourth (#4) surface, separated by a ½-inch of argon-filled space. The configuration generates a winter nighttime U-value of 0.20, insulating performance better than or equal to competing dual-pane IG units on the market, it is reported.  These type of units are designed to enable window and door manufacturers to make better-insulating products without multiple air spaces, which can complicate the manufacturing process and add to the cost that builders, remodelers and homeowners pay for windows. PPG’s dual-coat, double-pane IG configuration has visible light transmittance of 60 percent and a solar heat gain coefficient of 0.26, the company also reports.