Window film is a thin material, usually made of polyester, in multiple layers, and treated with reflective coatings to help homeowners and business owners save energy by retrofitting existing existing windows. Professionally installed window film not only helps property owners save on energy costs, but it also helps reduce the deterioration of interior furnishings, fabrics, and floors by blocking harmful ultraviolet (UV) radiation.
window film is generally made of polyester or Polyethylene Teraphthalate (PET). PET is in many products and is the same polymer that you find in the manufacturing of water bottles.
There are a number of different window films from a variety of manufacturers to choose from. A typical architectural grade window film is made of multiple thin layers of PET. Some layers are clear while others are dyed or have pigments added to darken or colorize the film. In addition to these layers, another layer is added with metal or ceramic coatings to reflect or absorb energy. Finally, a clear hard coat is added to the film to provide durability and protection against scratching.
Window film is typically installed on the interior side of glass, but some films can be applied on the exterior side under special circumstances.