is EdgeGuard, how does it work, and why is it of value
is a patented application of a thin, transparent layer
of high-impact, durable plastic installed around the
outer edge (2-3'') of your windshield.
does it look like installed on a windshield?
much like the windshield wipers, rear view mirror,
and windshield itself, drivers and passengers alike
very quickly forget it's even present.
the EdgeGuard material is around the entire
perimeter of the windshield, it's only visible
on the lower passenger side of the windshield.
EdgeGuard from inside the same vehicle; passenger
field of view not impaired.
does EdgeGuard do?
as it may initially be to believe (see below) , it
prevents the leading cause of windshield replacements
can a piece of plastic installed around the perimeter
of a windshield prevent cracks that can lead to your
windshield needing to be replaced?
of the way windshields are manufactured, bending and
rapid cooling of the glass results in stresses being
concentrated in the outer 2-3" of the windshield.
These "manufacturing" stresses are further
amplified when the windshield is installed within
the rigid frame of your vehicle. This effect
is documented in a study conducted by engineers at
Daimler Chrysler and Stress Photonics in a paper entitled
"Windshield Investigation - Manufacturing and
Installation Stresses" published in 1999 by the
Society of Automotive Engineers. Photographs
taken using a stress-indicating polariscope illustrate
edge of windshield prior to installation showing
of windshield after installation showing manufacturing
& installation stresses.
within materials naturally seek to be relieved.
One way this can be accomplished is by cracking -
the greater the stress, the easier it is to crack
the material. When a piece of road debris strikes
your windshield, it may or may not crack the glass
- it all depends on the energy the debris transmits
to the glass and the amount of stress inherent it
the area it strikes. Because the outer 2-3"
perimeter of the windshield has a much higher concentration
of stress than the inner portion, the likelihood of
a given piece of debris causing a crack is significantly
greater when it hits the outer perimeter vs. the center.
was proven out by an independent study carried out
by Knott Laboratory published in a paper entitled
"A New Polycarbonate and Glass Laminate and Its
Affects on the Relationship Between Residual Tensile
Stresses and Impact Resistance of Windshields"
also published in 1999 by the Society of Automotive
Engineers. In this study, windshields from six
different manufacturers were tested for the amount
of energy required to initiate cracks in different
areas of the windshield. They found on average
that the amount of kinetic energy required to cause
a crack in the center of the windshield was over
2.5 times greater than on the outer 2-3"
also confirmed this phenomenon in the real world.
In surveys of over 10,000 vehicles in shopping mall
parking lots, 83% of all windshield cracks were initiated
by an object striking the vulnerable outer 2-3"
area of the windshield - the very same area protected
the effectiveness of EdgeGuard, the Knott's Laboratory
study also compared the amount of energy required
to cause a crack the perimeter area of windshields
protected and not protected with EdgeGuard.
In this portion of the study, they found that on average,
the amount of energy required to cause a crack was
over 1.8 times greater in areas protected
by EdgeGuard vs. those that were not.
not convinced? Consider the following analogy.
A windshield is like a baseball batter. Both
have objects thrown at them. The batter has
a vulnerable area he or she protects - their head.
The windshield has a vulnerable area as well - its
perimeter. The batter protects his or her head
with a helmet. The windshield can be protected
that's all nice - so what? Why do I care if
I have a cracked windshield?
- Your windshield plays a critical role in protecting
you and your passengers in the event of an accident. A
damaged windshield significantly increases your
chances of head and neck injuries in a roll over!
To learn more, click
- It's important to keep your original windshield
for as long as possible. Your original windshield
is the safest windshield your vehicle will ever
have. To learn more, click
- It's a hassle to get your windshield replaced
and chances are, it won't be done properly. To learn
more, click here
prolonging the life of your original windshield for
as long as possible, EdgeGuard maximizes your safety
and reduces the time and money you spend replacing
is also friendly to the environment in that it reduces
the number of windshields sent to landfills.
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