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Physics of Windshield Repair
Many other companies pushing their windshield repair products don't want you to know that a physics person
wouldn't agree that pressing resin into damaged glass to exchange the resin with pressure and vacuum cycles is better
than vacuuming out the air first. One manufacturer says their wet vacuum
injector evacuates ALL the air first, this is incorrect. Only part of the air
is removed which forces the resin-air exchange to start. Some of these
companies show pictures of a gentle glow of the U.V lamp with a shiney
stainless steel injector saying "do it right" when the process is STILL a wet
vacuum injector! Wet vacuum injectors are obsolete regardless of how pretty
they are, wet vacuum injectors are slower and will trap all moisture in the
damage once resin is on the glass. People in physics will tell the wet vacuum injector
isn't nearly as efficient as causing a hard vacuum over the damage
without a resin pool on the glass.
There is approximately 21 miles of air over
us. Gravity forces this column of air to weigh a certain amount. Normally at
sea level there is 14.7 pounds of air pressure and in places like Denver, CO,
the air pressure is approximately 9 pounds per square inch. We don't realize
this sometimes because we are so used to the air pressure.
Air pressure is always around you and understanding the air pressure must be
removed from the damaged glass first, helps you to do better windshield repair.
The air pressure instantly gets into every nook and cranny of damaged glass.
Physics people will agree removing this air along with moisture is essential to
performing successful windshield repair. This air pressure is within the damage.
Thus the damage is pressurized with air. Air also contains
some water vapor because all air has water vapor within it. This water vapor
remains a vapor until the temperature and dew point spread closes on each
other. When the temperature and dew point spread matches up, the water vapor
turns into liquid water. The amount of water vapor in the air depends on the
relative humidity. Some parts of the country have very low humidity levels 20%
or less which is extremely dry. Many areas of the country have humidity levels
at 60% or to as much as 85% or more. It is in this area of the country where
Super Cinch tool is most useful, not only for speed of the repair but for
quality and strength of the repair. Once resin has been placed directly onto
the glass, no matter what amount of moisture was within the damage, the resin will stay in the
damage. Liquid moisture is not a friend of resin. Resin mixing with water
produces weaker repairs and repairs that are un-sightly with far less strength.
In many areas of the country moisture is a big problem for people in windshield
repair making repairs much more difficult and time consuming even for the best
equipment on the market. Super Cinch makes getting moisture out of the damage
much easier.
Super Cinch allows for the resin to be held up off the glass while
subjecting the damage to as much as 28 inches of vacuum. At 95-115 degrees F
with this kind of vacuum, liquid moisture vaporizes. If resin is on the glass
heating the glass just heats the glass, it will not get rid of moisture.
Conventional repair systems all have this inherent disadvantage. Conventional
repair tools cannot match Super Cinch in quality within a reasonable time.
Super Cinch will get moisture from the damage with heat and vacuum. The break
is always subjected to the high vacuum levels and then the glass is cooled
while under vacuum. Since the water vapor has left the damage with the vacuum,
moisture cannot re-occur in the damaged area. The injector is lowered to the glass
and pinches off the back side of the insert seal blocking off the primary
vacuum and isolating the vacuum within the damage. The piston is lowered and
resin is injected directly into an isolated vacuum pocket. Results are fills
that are extremely quick. Sometimes bulls-eyes or stars can fill in a second or
two, not 15 to 30 minutes as with conventional equipment.
Windshield repair is very much the same as vacuum injection molding. The damaged glass is
the mold to be filled. The vacuum empties this pocket of air and injects
directly into the evacuated area. Same is true for vacuum injection molding.
Filling molds in this manner results in void free molds. Filling windshield
damage in the same manner results in clearer and stronger repairs. Air
pockets and unfilled cracks within the damage is unacceptable. People demand
quality repairs now, not excuses.
If anyone has doubts, please call your local college and ask for the physical science dept and simply ask them
if evacuating the break first is the best way to effectively repair glass.
We want to help you, the technician, do a better job by giving
you the real facts. Buy Super Cinch now! Use our secure online
store to order yours today.
Coming soon: Video field repair demonstrations.
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