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The auto glass has undergone several structural and compositional enhancements and is now designed and manufactured with safety as its primary purpose. The specifications of the auto glass have been established to provide protection in case of accidents like a collision or a roll over. The laminated safety glass which is composed of a layer of vinyl sandwiched between two layers of annealed glass has been formulated to stay intact during high impact. If it is however weakened due to unattended damage it will not provide optimal protection when the accident occurs. What kind of damage then would require a windshield repair or replacement?
It is time to call for help when the crack or the chip is larger than a dollar bill or when it has three or more long cracks. With such damages it is a big probability that too much structural integrity has already been compromised. Attempting to do the repairs your self will only put you at risk of vehicular accidents in fact it might already be time to call for a auto glass replacement.
When you see stress cracks - These occur naturally due to inherent uneven distribution of forces in the windshield. It is crack that occurs without an object hitting the glass. It is typically due to a big change in the temperature such as when after sitting under the sun for several hours, you turn on the air conditioner. At this point if you repair and restore the original strength of the windshield, a reformation of the crack will most likely happen. It often starts at the edge of the windshield. Stress cracks will normally be a straight or slightly bending line, and it will not have any sign of impact. The "pen test" is employed to determine if the glass has a stress crack -the ballpoint pen is run along the crack, and if it dips anywhere, it means that glass has come off the windshield signifying that it is not a stress crack. You need a windshield replacement.
If there is damage to both auto glass layers or to the inner PVB auto glass layer. The PVB material is so sensitive to moisture. Deviation by more than this 0.05% moisture will so severely affect the way the glass sticks to it that it would no longer meet the federal codes for penetration resistance, nor meet the safety standards for glass adhesion. You need a windshield replacement.
If the crack or chip occurs in the acute area, you need a windshield replacement. The acute area which is the standard for the driver's area of critical vision is about 8-1/2 inches high and 11 inches wide and is directly in front of the driver's eyes, beginning just above the steering wheel.
If the breaks have visible impurities that cannot be removed - the debris may impede resin flow and complete filling of the cracks thus making quality auto glass repair impossible. You would have to go opt for a windshield replacement.
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