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September 16, 2010

How Does Window Film Work? A Complex Answer with Simple Results

Refletive_diagram Being a leader in the window film industry, we get this question often: “How does window film work?” 

Using window film in your home, commercial buildings, and vehicles helps to protect you and your property from the damaging effects of the sun. Over time, the sun's heat and harmful UV rays contribute to the fading of interior furnishings, fabrics, artwork and flooring and can cause uneven or very warm temperatures within a building or vehicle.

SUN-GARD window films help alleviate sun-damaging effects, by blocking up to 99% of UV rays and reflecting more than 78% of the sun's heat.  We all know it works, but how does it work? 

Basically, by increasing the amount of solar heat that is reflected or absorbed by the film, window film reduces the amount of heat that is transmitted through the glass. Reducing solar heat offers a more comfortable interior space in a building or vehicle.   This protects against fading, heat and sun damage.

More specifically and according to the US Department of Energy heat rejection films are normally applied to the interior of flat glass windows to reduce the amount of infrared, visible light, and ultraviolet (UV) radiation entering windows. Such films are either dyed or metalized (which can be transparent to visible light) to convert incoming solar radiation to infrared radiation, which is then rejected back through the glass to the exterior. Solar control film added to windows can reduce energy loss by as much as 30-50 percent.

Ultraviolet light and solar heat coming through any window can cause fading and irreparable damage to the things you value most. 90% of fading is caused by a combination of UV radiation, heat and visible light. Film (in varying degrees) blocks a large percentage of all three thus helping to prevent fading or at least significantly slowing its progress.

Causes of fading At SUN-GARD, we utilize numerous processes in the construction of our films, allowing us to provide a varying degree to which our films reduce solar heat transmission. Some films contain a layer of metal that provides a high amount of solar heat reflection (even though the film itself is not necessarily reflective). Other films contain no metal but still offer a level of heat rejection that will provide significant benefits. Please consult your SUN-GARD dealer to find out which film is best for you. 

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