Urethane is the adhesive that is used during the replacement process that helps the new glass part bond to the vehicle. There are many different chemical companies that make Urethane and there are many differences between the different types of Urethane. Some Urethane cures or hardens faster then others. Certain Urethane types are designed to be used in different climates where humidity levels and temperatures are different. Factors like humidity and temperature come into play when you are planning a replacement. If the Urethane does not cure properly it can compromise the structural integrity of the vehicle and put the occupants at risk in the event of a front end collision or rollover accident.
Certain car manufacturers engineers design vehicles in a way to withstand certain stresses such as torsional twisting, tension, shear and compression. These stresses put stress on the Urethane and the engineers select the Urethane based on the Urethane’s ability to withstand these types of stresses and still return to it’s original form.
Newer vehicles and manufacturers like Mercedes, Volvo, Volkswagen, BMW & Audi are using a different type of Urethane called High Modulus Urethane. This specific type of Urethane is supposed to provide extra strength to help the vehicle resist torsional twisting, help stabilize the vehicles ride and also make the vehicle more quiet inside. Manufacturers are also stating that High Modulus Urethane also helps preserve radio, cell phone and global positioning system reception within the vehicle in OEM encapsulated replacement parts such as the windshield, side windows, vent windows, quarter windows and back glass.
Only certain types of Urethane are considered High Modulus Urethane and one of those is Dow Automotive’s Betaseal One Urethane.
It is important to follow the manufacturers specifications when doing an auto glass replacement because if the wrong Urethane is used it could possibly make the vehicle less safe to drive.