Solarban® 60 (2)/Sungate® 600 (4) R-5 Insulating Glass Unit
PPG has introduced a dual-coat technology that can help dual-pane insulating glass units (IGUs) attain R-5 insulating performance, which by definition means a winter nighttime U-value of 0.22 or less, without triple-glazing. As depicted in the illustration to the right, the technology incorporates one pane of 3-millimeter Solarban® 60 glass on the second (#2) surface of the IGU and one 3-millimeter pane of Sungate® 600 glass on the fourth (#4) surface. The two panes of glass are separated by a ½-inch of argon-filled space.
Sungate 600 coated glass was developed specifically for use in a fourth-surface application. The pyrolytic method of applying the Sungate 600 glass coating makes it durable, while the star crystalline structure gives it a smoother surface.
The Solarban 60 (2)/Sungate 600 (4) IGU enables residential windows to achieve R-5 center-of-glass insulating performance. The technology also yields Visible Light Transmittance (VLT) of 64 percent and a Solar Heat Gain Coefficient (SHGC) of 0.36. Consequently, the IGU effectively combines the clear glass appearance many homeowners desire with energy-saving insulating performance being emphasized by the federal government and many local residential building codes.
SuperSpacer Insulating Spacers
Cambridge manufacturers IG with SuperSpacer technology, which have been improving the performance of residential windows since it’s introduction. In addition to reducing heat loss, Superspacer spacers extend the service life of residential windows by flexing to accommodate temperature-related expansion and contraction. As a result, SuperSpacer-equipped windows have fewer sealant-related failures, enabling them to retain insulating argon gas longer and more effectively than less robust spacer assemblies.
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