There are six factors affecting fabric fading:
1. Ultraviolet Light
2. Visible Light
3. Heat and Humidity
4. Chemical Vapors (including ozone)
5. Age of Fabric
6. Dye Fastness
Clear single pane glass (1/8″ to 1/4″) will reject 23-28% of the ultraviolet light from the sun. Insulated glass is slightly better rejecting 36-41%. Window films installed on glass reject 95-99% of solar ultraviolet light.
Different types of clear glass and window systems will reject 13- 29% of the solar heat. With window films, 80% solar heat rejection can be obtained.
No window film can eliminate fading. It can, however, offer maximum protection from fading due to solar ultraviolet light and solar heat.