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Auto Glass Specialists |
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Phoenix Glass Inc® |
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When
Phoenix Glass replaces a windshield, Betaseal/Essex adhesives are used to install windshields on nearly every domestic vehicle and two thirds of all vehicles manufactured worldwide to help restore a vehicle to its original strength and retain a windshield during a crash. Not all adhesives have the strength required to allow the vehicle safety systems to perform correctly. To assure that the windshield is replaced properly it's absolutely imperative that the correct adhesives as well as adhesive primers are used.
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> Urethane Adhesives
The short answer is that your VW, along with many other German automobile manufacturers, have mandated a rigidity requirement on the vehicles that they produce. In order to meet that engineering requirement and retain the structural integrity of the vehicle it is necessary to use a different type of urethane. High Modulus urethane adhesives provide the extra strength to help the vehicle resist torsional twisting as well as help quiet and stabilize the vehicles ride. Another added plus that is built into High Modulus Urethane is that it preserves radio, cell phone, and global positioning system reception in OEM antenna encapsulated windshields and backlites.
The long answer is now that you have learned how important it is and how it all works together we're going to recap a bit as we get into why it's so important to not only make sure your new windshield is installed with a High Modulus adhesive but with the "right OEM type" of High Modulus Urethane. If you read mulitple adhesive manufacturers literature to determine whether their urethane is high modulus, you will find different definitions of the term. Some manufacturers define their adhesives as "modulus enough" or "high on the OE specification for high modulus classification," but does that really mean that they can be classified as high modulus adhesives? To answer that question, first we must define what high modulus means. High modulus is a rigidity requirement of cured adhesive. It measures the ability of the adhesive to withstand a variety of stresses and still return to its original form. It must be able to withstand tension, compression, shear and torsion without adhesive or cohesive failure. High performance and luxury vehicle manufacturers specify and use adhesives like BETASEAL ONE because they can use it as a structural element to stablizie the vehicle which improves the ride and reduces rattles, vibrations and other vehicle noises. High modulus adhesives have a much higher resistance to stress. This characteristic enables high modulus adhesives to stiffen the vehicle body, improving handling and overall stablility in vehicles designed to use this advanced technology. Vehicle designers place greater demands on high modulus adhesives. The adhesive bears much more of the pushes, pulls and twists associated with everday driving. High modulus adhesives must have a higher elastic resistance than normal so they will not deform or rupture under the increased stress. So how do adhesive manufacturers know which property and specification should be met in order to be high modulus? To clarify, it must be understood that an adhesive is either high modulus or it is not. There is no in between modulus that is good enough for all vehicles.
According
to Mercedes specifications, The Bottom Line A urethane manufacturer cannot claim to be "on the high end of the specification" and therefore be considered "modulus enough" for all vehicles. Any urethane manufacturer claiming to be high modulus should be able to provide supporting data, to include laboratory testing as well as technical data.
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