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Solar control window
films are designed to specifically control the sun’s electromagnetic
energy. Because of this, you can select a window film product based on
the transmittance, reflectance and absorptance performance characteristics.
Performance results are provided for three distinct regions within the
spectral distribution of solar radiation and they are: ultraviolet, visible
and near-infrared.
With this information
one can decide whether a particular film meets or exceeds expectations
for aesthetics, occupant comfort and total solar energy rejection performance. Click a link below to see performance stats on our products.
Important
terminology:
Transmittance
Measures the percentage of solar energy and visible light (daylight) that
passes through a glazing system. All solar control films reduce visible
light transmission in order to provide solar heat control. Lighter films
tend to transmit higher levels of solar energy and visible light while
darker and more reflective films have lower transmittance levels.
Absorptance
Measures the percentage of solar energy and visible light that are absorbed
by the window film. As absorptance levels of a particular film increase,
so will the temperature of the glass. Always refer to a manufacturer’s
film-to-glass installation recommendations.
Reflectance
Measures the percentage of solar energy and visible light that are being
reflected by the window film. Highly reflective films offer high heat
rejection capability.
Newer technology films need not be dark nor highly reflective to provide
impressive solar energy performance.
Emissivity
Measures the surface’s ability to absorb or reflect far-infrared
radiation. The lower the emissivity the higher the far-infrared reflection.
U-Value
A measurement of heat transfer due to outdoor/indoor temperature differences;
describing the dealt loss through a material. The lower the U-Value, the
less heat transfers.
Shading Coefficient
(SC)
The ratio of solar heat gain passing through a glazing system to the solar
heat gain that occurs under the same conditions if the window were made
of clear, un-shaded double strength window glass. The lower the number,
the better the solar shading qualities of the glazing system.
Total Solar
Energy Rejected
Measures the window film’s ability to reject solar heat in the form
of visible light and invisible infrared radiation.
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