Low-E Glass

What is low-E glass (low-emissivity coated glass)?
How many types of low-E glass are on the market?
Is all low-E glass the same?

Low-E glass refers to glass with a low-emissivity coating. It reduces heat gain or loss by reflecting long-wave infrared radiation (heat) and therefore, decreases the U-value and solar factor and in doing so, improves the thermal insulation of the glazing. Because of its relative neutrality in appearance and energy efficiency, glass with low-E properties is widely used in residential and commercial buildings and is expected to continue to increase in usage in the coming years.

Low-E glass is manufactured by vacuum deposition (sputter coating). It applies various metals, metal oxides or other materials off-line in a large vacuum chamber. Sputter coatings are offered in a wide variety of color and performance options, including post-temperable versions, and can meet and exceed energy code requirements.

Guardian Industries manufactures SunGuard and ClimaGuard brand post-temperable sputter coatings at multiple locations in the U.S. and Europe. The SunGuard and ClimaGuard coatings are sputter coatings, not pyrolytic.