VLT : Visible Light Transmittance
The percent of total visible light that is transmitted through the window film/glass system. The lower the number the less visible light transmitted. For example 5% VLT film will only pass 5% of sunlight through it making it a dark film. 50% VLT film is passing 50% of the light which is considered a light film. For reference clear glass window is about 88% VLT. ).
The percentage of solar energy that is absorbed by the window film and glass system. This solar absorption is that portion of total solar energy neither transmitted nor reflected. The lower the number, the less solar radiation absorbed.
A form of electromagnetic radiation. Infrared light wavelengths are longer than those of visible light, but shorter than those of microwaves. (The prefix 'infra' means 'below; infrared refers to radiation below the frequency of red light.) Infrared light is primarily thermal radiation (heat).
The percent of incident solar radiation that is transmitted through the window film/glass system. The lower the number, the less the solar radiation transmitted.
The percent of solar radiation that is reflected by the window film/glass system. The lower the number, the less solar radiation reflected. Value is usually expressed as a percent (%). The lower the number, the less solar radiation is reflected.
Solar Energy Rejected
The percent of total solar energy (heat) rejected by the window film and glass system. The higher the number, the more total solar energy (heat) rejected.
The ratio of solar heat gain passing through window film to the solar heat gain that occurs under the same conditions without any film upon it. The lower Shading Coefficient number the better solar control efficiency.
The measure of surface's ability to absorb or reflect far-infrared radiation. The lower the emissivity rating, the better the insulating qualities of the window film/glass system.
The percentage of dazzling or sharp brightness reduced by the window film.
Window film that uses either a dyed adhesive process or submersion process to deposit dye onto its surface to achieve tinted film.
Metalized & Sputtered
A process where metals are applied onto a layer of film. Different metals produce different hues and performance capabilities to meet the varying consumer needs. A process that imbeds metal particles such as titanium, silver, gold, stainless steel, copper and chromium onto the film. This process involves knocking metal atoms off a disc of pure metal with charged and energetic atoms called ions. This ensures film is color stable with excellent solar performance.
Window film that is a combination of metallic film and dyed film with a smooth semi-reflective look.
Unit of length for 1/1000 of an inch (.001Ħħ). Used in expressing thickness of films.