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Window Makers Roll Out Cardinal's New LoE3 Glass

07/02/07

Alex Wilson - This article was produced by BuildingGreen, Inc.- www.buildinggreen.com

Cardinal Glass Industries, the nation’s largest manufacturer of coated glass for residential windows with an output of 700 million square feet per year, has introduced an improved low-emissivity (low-e) coating, LoE3 366 (“Low-e cubed 366”). The glass offers high visible light transmittance as well as low solar heat gain, making it appropriate in most applications except where solar gain is desirable for passive solar heating (south-facing glass in heating climates). The manufacturer recommends LoE3 366 for all regions of the country.

Photo Courtesy Weather Shield® Windows & Doors
Weather Shield uses Cardinal’s LoE3 366 glass on its new top-performing, triple-glazed Zo-e-shield 7 windows.
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“It’s the best of both worlds,” said Bowie Neumayer, Cardinal’s national sales and marketing manager, touting a solar heat gain coefficient as low as many tinted low-e glazings while the visible light transmittance is nearly as high as the company’s widely used LoE2 product. These values are similar to those of several new commercial glazing products, such as PPG’s Solarban 70XL and Viracon’s Solarscreen VRE-67.

“In the past, to get the best solar block, we lost a lot of visible light transmittance,” said Neumayer. Cardinal achieves LoE3‘s high performance by using three coatings of silver (thus the number 3 in the product name “366”; the “66” represents the percent visible transmittance). Cardinal, which revolutionized the glazing industry with its LoE2 glass, has high hopes for the new coating. “We think it will be the standard,” Neumayer said, though he said he doesn’t know how long that will take. “We definitely feel this is the future of low-e.”

A number of large window manufacturers are using Cardinal’s new LoE3 glass, including Milgard Windows, Weather Shield Windows and Doors Company, Kolbe & Kolbe Millwork, and Atrium Windows and Doors, though some companies will use their own brand names. Milgard, for example, sells windows with this glazing under its own tradename SunCoatMAX and Weather Shield under the tradename Zo-e-shield.

Glass with LoE3 366 will be slightly more expensive than glass with standard low-e coatings, according to Neumayer, reflecting the capital investments Cardinal has made in the manufacturing process and the complexity of the coatings. However, the payback on this extra investment from energy savings will be relatively short, he says. While the new glazing is just being rolled out, Neumayer said that Cardinal will be “able to cover whatever demand there is for it.”

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