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Window film is a self-adhesive polyester film that is applied to glass surfaces. It is used as a "retrofit" application for existing glass on automobiles, homes and commercial buildings in order to upgrade solar control, safety, and appearance.
Solar radiation from the sun is divided into 3 components: visible light we can see, infrared we feel as heat and ultraviolet rays, which are invisible. As solar radiation strikes a piece of glass, window film acts as a "sunscreen" to block harmful UV rays as well as regulate the levels of heat and light passing through the glass. The amount of heat and light rejected is dependent upon the type of window film selected.
Common types of window film – non-reflective or dyed films that primarily absorb solar energy, reflective or metallized films that absorb as well as reflect solar energy, and nano/ceramic films which use high-tech compounds to provide high performance.