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Below are definitions of the categories that
have been selected for the Cool N Lite®
TECHNICAL DATA chart. These classifications
were selected to most accurately represent
the overall efficiency of Cool N Lite®
solar control window film and to allow for
valid product comparisons in these critical
areas of evaluation.
All of the values in this specifications
guide are representative of many tests and
should be used for estimating purposes only.
All values are subject to small
manufacturing
tolerances; some values are estimated. This
data is based on the research of others and
is believed to be accurate.
All tests were generated using ASHRAE and
ASTM test methods. Ultra-Violet transmission
is taken at 3900 Angstroms. Test conditions:
West facing window at 4:00 p.m. Standard
Time at 40° north latitude on July 21,
assumed temperatures are 75° F indoors, 95°
F outdoors, with a 7.5 m.p.h. wind outdoors,
still air indoors: Winter U factor assumes
temperature of 70° F indoors and 50°
outdoors.
MATERIAL THICKNESS
is the thickness of the window film as
expressed in microns.
PLY
is the number of layers used in the
construction of any specific window film.
PERCENTAGE OF VISIBLE LIGHT TRANSMISSION
(ASTM E-903-96), is the
amount of visible wavelength of light
(380-780 Nanometers) that is transmitted,
i.e.,
how much sunlight is allowed to enter. The
lower the percentage, the less light and
greater glare protection.
PERCENTAGE OF VISIBLE LIGHT REFLECTANCE
(ASTM E-903-96) is the ratio
of the total visible solar energy that is
reflected by the film.
PERCENTAGE OF ULTRAVIOLET TRANSMISSION
(ASTM E-903-96) is the
amount of energy that is transmitted with
wavelengths between 100-400 Nanometers.
Ultraviolet radiation is one of the major
contributing factors in the fading or sun
damage process of interior furnishings. (All
Cool N Lite® professional quality window
films
have special UV inhibitors that block out up
to 99% of the ultraviolet radiation.)
PERCENTAGE OF GLARE REDUCTION
is the amount of the protection that any
specific window film will provide in
reducing sun glare in the visible light
range. This
figure is calculated by taking the visible
light transmission of the glass, then
subtracting the visible light transmission
of the film, then dividing that figure by
the
visible light transmission of the glass.
PERCENTAGE OF TOTAL SOLAR ENERGY
TRANSMISSION
(ASTM E903-96)
is the ratio of the amount of total solar
energy in the full solar wavelength range
(300 - 2,100 Nanometers) that passes
directly through the film.
U-FACTOR
is expressed in terms of BTU/SQ. FT. per
HR/F (1989 ASHRAE
FUNDAMENTALS HANDBOOK) is the overall heat
transfer coefficient of the
material. It is a measure of the insulating
capabilities of the glass and film in
reducing
heat flow in either direction. The U Factor
measures heat conduction from sources
other than radiant. The lower the number,
the better the insulating capability.
SHADING COEFFICIENT
(1989 ASHRAE FUNDAMENTALS HANDBOOK) is the
ratio of solar heat gain of any glazing
system compared to untreated glass. The
lower
the number, the more effective the material
is in keeping radiant solar heat out. For
example, the shading coefficient of Titan SR
Dark is .22 which means
that only 22% of the radiant heat is allowed
to pass through the film…a full 78% is
reflected.
EMISSIVITY
(ASTM E408-71) is the ratio the long
wavelength radiation (8,000 -
12,000 manometers) from a surface as
compared to a full emitter or black body.
The
lower the figure, the better the thermal
conductivity or insulating capability.
Emissivity
is one of the measures of how effective a
material for retaining interior energy.
PERCENTAGE OF TOTAL SOLAR ENERGY
REFLECTED
(ASTM E903-96) is the
ratio of the amount of the total solar
energy in full solar wavelength range (300 -
2,100 Nanometers) that is directly reflected
by the film.
PERCENTAGE OF SOLAR ENERGY ABSORBED
(ASTM E903-96) is the ratio of
the amount of total solar radiant energy
that the material prevents from passing
through; i.e., how much of the heat is being
blocked or prevented from directly
passing through the film.
PERCENTAGE OF TOTAL SOLAR ENERGY REJECTED
is the amount of solar
energy/heat that is reflected and absorbed
and takes into consideration the NI
Factor, which is how much of the absorbed
energy, is re-radiated inward. Total heat
rejection is calculated by adding the
percentage of solar energy reflected and 72%
of
the energy absorbed.
FIRE TEST:
Cool N Lite® solar control window film has
been tested for flame resistance in
accordance with Federal Test Method #CCTI 81
B, Method #5902 for vertical,
Method 5906 for horizontal and the Dept. of
Commerce Test Method #CS18253 for
forty-five degree angle. When properly
installed, Cool N Lite® solar control window
film
materials do not support combustion. |
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Understanding
Ultraviolet
Radiation |
Understanding
Infrared
Radioation |
Film
Construction |
Understanding
Solar Energy |
Methods of
Heat Transfer |
Reducing Heat Loss
in Cold Weather |
Does Blocking UV
Light Affect Plant
Life |
High Tech Film
Abbreviations |
