What is Low-Emissivity Glass?

Low-emissivity glass, commonly called low-E glass, is a type of reflective glass that is gaining in popularity, especially in residential and office applications. Low-E coatings are very thin metallic coatings that reduce visible light transmission by about 10 percent compared to uncoated glass. They are applied using either the vacuum (sputter) or pyrolytic process.

Benefits of Low-emissivity Glass

Low-E glass reduces heat loss through windows and re-radiates the heat absorbed from sunlight back inside the room. Low-E glass allows sunlight into a room without letting heat escape outdoors. Because it resists ultraviolet light, low-E glass prevents sunlight exposure from damaging carpets, draperies and other furnishings. Plus, low-E glass reduces sunlight glare in a room.

The main reason low-E glass has these advantages is that it reflects “sensible heat.” The heat generated by hot water or steam radiators, or the heat from hot air ducts, are examples of sensible heat. Low-E glass retains more of this heat indoors than other types of reflective glass. In northern areas, low-E coatings let in the heat from the winter sun while retaining the heat generated from inside the building. In southern areas, low-E coatings are usually applied to bronze, green or gray tinted glass. The coatings reduce glare and reflect the sun’s heat away from the structure.

Have questions about a low emissivity glass project for your home or business? Contact your local Glass Doctor at 833-974-0209 for upfront pricing, expert workmanship and 24/7 emergency service. We fix your panes!®

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