Low-E coatings

Two processes, referred to as sputtered and pyrolitic, were developed to produce large volumes of quality, low-e coated glass. Pyrolitic coatings are incorporated into float glass production and tend to be more durable. Sputtered systems use a stand-alone vacuum deposition process to produce coatings that are have lower emissivities but that are softer and need more protection than pyrolitic coatings. 

Radiarion heat transfer behvecn a room and its windows is proportional to ihe emissivity of the glass surface, and low-e coatings on Ihe inner surface of the windows reduce heal loss in winter and heat gain in summer. 

C What is the effect of a low-e coating on the inner surface of a window glass on the (o) heat loss in winter and (b) heat gain in summer thiougli the window ... 

Low-E Coatings (Window) Films - A coating applied to the surface of the glazing of a window to reduce heat transfer through the window. 

Low infrared emission (low-e) coatings or finishes are transparent to visible light but opaque to infrared radiation, thus reducing total heat flow. Low emission may be achieved by the use of very thin metal or metallic oxide films, e.g. silver, tin oxide or alumina coating, which are almost transparent. 

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