Comments Off on Here is a recent example of common adhesive bonding problems that I come across WAY too frequently.
A couple days ago I was stuck in the heat late afternoon on the other side of town to cut out a Ford F150 windshield. It practically pushed itself out except for the bit of old glue left that you see in the image. Very little cutting required. The bare part of the windshield had no bonding effect. Now THAT’S scary. If the airbags were to deploy, this windshield wouldn’t have stuck around, and neither would have the passenger(s) in a head on collision. Prevention:
Clean the glass thoroughly of all contaminants, especially oils from the skin.
Clean the pinch weld as well so once it’s trimmed, dirt is less likely to contaminate the freshly cut old glue (acts as a primer.)
On average, 13 to 14 million windshields are manufactured or imported into the U.S. every year due to damaged windshields. Laminated safety glass is used for windshields to reduce flying glass and occupant ejection from the vehicle in collisions. Windshields are secured to the vehicle body (pinch weld) using high-strength urethane adhesives. There are different types of urethane with different bonding and curing characteristics.