Technical Terms
VLT : Visible Light Transmittance
The percentage of how much of light passes through a window film. Darker window film allows less light to pass through which means low VLT. For example 5% VLT film is only pass 5% of sunlight through which is avery dark film. 50% VLT film is passing 50% of the light which is considered a very bright film. As a reference clear glass window is about 89% VLT. Value is usually expressed as a percent (%).

Solar Reflectance
The percentage of solar energy that is reflected away by the window film. Value is usually expressed as a percent (%).

Solar Absorption
The percentage of solar energy that is absorbed by the window film and glass. This solar absorption is that portion of total solar energy neither transmitted nor reflected. The value lower than 00% is recomended as safe factor for dual pane windows

Solar Transmittance
The percentage of total solar energy that passes through a window film. The ratio of solar energy that actually passes through the glass is the total solar transmittance. Total Solar Energy = Solar Refelctance + Solar Absorption + Solar Transmittance

Solar Energy Rejected
This measurement generally shows a window film's ability how much heat from the sun can be blocked. This solar energy includes visible light, infrared radiation and ultraviolet energy. The higher a film's Solar Energy Rejection capabilities, the higher the film's ability to deflect solar energy.

Ultraviolet (UV) Rejected
The percentage of Ultraviolet energy deflected away by the window film. UV is one portion of the total solar energy spectrum which greatly contributes to fading and deterioration of fabric and furnishings and may causes skin damage as well as skin cancer. All of Geo Window Films blocks harmful UV rays 98-99%

The lower the emissivity rating (Low-E), the better the film is at insulating heat and energy. In the window film industry, emissivity refers to the how much of heat retained in the room or car by the film. Lower emissivity ratings are desirable for preventing interior heat loss.

Shading Coefficient
The ratio of solar heat gain that passes through a filmed window to the solar heat gain under the same conditions without any film upon it. A lower Shading Coefficient number entails better solar control efficiency.

Glare Reduction
The percentage of dazzling or uncomfortable brightness reduced by the window film.

Metalized & Sputtered
A process where metals are applied onto a clear, polyester film as an even layer. Different metals produce different hues and performance capabilities to meet the varying consumer needs. A process that imbeds metal particles such as silver, stainless steel, copper, gold, titanium and chromium onto polyester film. Rolls of film are unwound and passed over target materials, depositing atoms evenly on the surface of the film through ion bombardment. This ensures long-lasting color and excellent solar performance. BSF was the first in the industry to sputter-coat window film. Sputtered Film is considered as a better performing film than a metalized one. Geo sputtered films constructed with nichrome (compound of nickel and chrome) or combination of nichrome and silver.

Unit of length for 1/1000 of an inch (.001"). Used in expressing thickness of films. As a reference business card's thickness is 12mil. For home security film 4mil or 7mil is a good choice and for commercial buildings 8 mil or thicker film is prefered.
Technical Terms
Technical Terms
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