the past three decades a tremendous amount of research has
gone into the development of window film. This research has
resulted in the ability of window film to selectively filter
desired wavelengths of light.
3M window film filters 99% of the sun's ultraviolet radiation.
This means that even the lightest films work well for fade
is window film made of?
film is composed of alternating layers of a polyester polymer
and a laminating adhesive.
of the specific type of film, the polyester layer may be
dyed, metalized, coated with an ultra violet inhibitor,
or simply added for additional strength.
are added to give the film it's characteristic color. Dyes
also work to reduce the amount of heat entering a room by
absorbing some of the light. A broad variety of dyed films
are available to ensure that one will match your specific
metalized coating is the heart of the film's efficiency.
Various methods of metalizing have been developed to guarantee
that a uniform layer is distributed onto the polyester layer.
The metalized layer reflects light and heat back into it's
incident direction. The release liner protects the pressure
sensitive adhesive from exposure prior to it's application
onto the glass surface.
are light, heat, and fading related?
by itself is not heat. Light is converted into heat when
it is absorbed by a substance, such as clothing, carpet,
or furniture. Light is not converted into heat if it is
reflected. The most efficient window films are reflective
because rather than convert light into heat, they simply
reflect it back to its source.
is a common misconception that ultra violet light causes
fading and that by eliminating ultra violet light fading
will stop. The fact is that there are many sources of fading.
Ultra violet light is about 40% responsible for fading.
Visible light and heat also contribute significantly to
fading. Eliminating ultra violet light certainly reduces
fading. To further reduce fading heat and visible light
may be reduced.
is "Low E"?
heated, a surface may either absorb or reflect the incident
heat. Emissivity refers to the ability of a surface to absorb
or reflect heat. Low emissivity means that the surface is
a poor absorber of heat, hence the heat is reflected. Low
emissivity window film works in the summer by reflecting
heat back outside, preventing it from entering through the
window. Low emissivity window film works in the winter by
reflecting heat back into the home, keeping it from escaping
to the outside.
emissivity of some common materials are listed below:
emissivity window films 0.29 - 0.45