Product Information
Generally,
window film provides specific personal and property
protection from the
effects of the sun as well as added safety
and
security in the events that result in broken glass.
The concept of window film for
use in solar control flat glass application dates back to the
early 1960s. The original film design objective was to control
the heating and cooling imbalances that result from solar
loading. Such early films were found to reflect solar radiation
back from a window, preventing the warming of inside surfaces
normally hit by direct sunlight while still allowing vision
through the glass.
As the window
film concept was developed and improved upon, a demand developed
for colored sun control films that
would complement
architectural design. Coloration of film was achieved through
various means to produce colors such as bronze, gray, gold,
amber, etc.
The energy
crisis of the early 1970s prompted an interest in another aspect
of window film use: the reduction of heat loss to the outside.
It was discovered that polyester film tended to absorb and
reradiate long wave infrared heat rather than act as a
transparent medium. Through experimentation, new film materials
and constructions were developed that enhanced this
characteristic. These films greatly improved heat retention
within a room's interior.
The
efficiencies of solar control window films are closely related
to local weather conditions, building orientation, window size,
and other factors such as exterior shading conditions. However,
with escalating energy costs, products such as window film are
increasingly valuable as an investment for commercial and
residential owners and commercial facility managers.
There are many
types and constructions of solar control and safety window
films. These films are considered in the building industry to be
"retrofit" products; that is, products to be applied to existing
buildings as opposed to use in new construction. In their
simplest forms, window films are composed of a polyester
substrate to which a scratch resistant coating is applied on one
side; a mounting adhesive layer and a
protective release liner is applied
to the other side. When the release liner is removed, that side
of the film with the adhesive is applied to the interior surface
of the glass.
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