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*******www2.dupont****/SafetyGlass/en_US/index.html?scr=metacafe_dupont_sentry_01 If it can be made out of glass, it can be made safer, stronger, more durable and storm resistant with SentryGlas®. Laminated glass, such as DuPont™ SentryGlas®, was developed as a safer and stronger alternative to glass. When used as a design or structural element, DuPont™ SentryGlas® can withstand threats from natural and man-made disasters. Stephen Bennison, s Senior Technical Associate, and Valerie Block, an Architectural Marketing Specialist, from DuPont discuss the history of laminated glass and the safety benefits of laminated glass solutions.
Stephen Bennison, Senior Technical Associate DuPont™ SentryGlas®: Well laminated glass is a certain class of safety glass. … where glass is combined with a tough plastic. And what it essentially does is it takes all the good things about glass being, … transparent, clear and durable. But, … essentially deals with a problem with glass which is, … its brittleness.
Valerie Block, Architectural Marketing Specialist DuPont™ SentryGlas®: And, the feature that’s the most important feature about laminated glass, as opposed to the other glass products, is after breakage occurs, because the glass pieces stick to the interlayer material, as opposed to falling out of the opening onto the ground, or flying through the air and actually causing … other injury.
Stephen Bennison: As you all know, if … , glass gets broken, … it can provide, … cutting hazards. By combining the glass with the polymer what happens is essentially the polymer holds together the broken glass and reduces the risk of, … of injury, … to the people.
Stephen Bennison: Well, DuPont first got involved in, , the interlayer market for laminated glass, , really at the request of the U.S. government. That was back in the 1930s, when, … , the automotive … the early automotive industry real … realized it had a tremendous problem, , with the, , safety of glass in car, , windshields.
Valerie Block: As I understand it, it was a joint research project that involved a number of glass manufacturers, and interlayer suppliers, through the Franklin Institute in Philadelphia. So it was actually a research project that was considered to be of utmost importance, because of the issue of occupant and driver safety. And then, in the 1970s, there was a safety glazing standard that was passed in Washington, D.C., which effectively led glazers to use laminated glass in hazardous locations. At that point, they looked to the standard PVB that had been used in automotive applications, for this new safety glazing architectural application. So essentially, it just hopped from automotive into the architectural setting.
Stephen Bennison: Now in the early 1990s, … in Florida, especially, after Hurricane Andrew, there was a realization that they needed to do an awful lot more about improving the construction and, … the sturdiness of, … houses and buildings down there, to essentially deal with the risk of hurricane, … hurricane damage.
Valerie Block: The Building Department in South Florida decided to institute a testing program, standards, and building code requirements for glazing. And, laminated glass became the natural choice, because the glass retention features of laminated glass made it an excellent choice to resist any kind of flying debris that would occur during a hurricane. the original interlayer, PVB, polyvinyl butyral, was successful in some applications, but in others, it was not the best choice for an interlayer, and that led us to go back to develop a stronger, stiffer interlayer, which was SentryGlas®
*******www2.dupont****/SafetyGlass/en_US/index.html?scr=metacafe_dupont_sentry_05 DuPont is one of the leading suppliers of glass laminating products and services in the world. Not only does DuPont™ SentryGlas® have an interlayer that’s many times stronger and stiffer than conventional interlayers, but it is also proven, through a series of weatherability and durability testing, to withstand extreme natural and man-made conditions.
Stephen Bennison, Senior Technical Associate DuPont™ SentryGlas®: There’s a tremendous amount of weathering and durability testing. , in fact, even before the products can be released on the marketplace, they have to go through basic weathering and durability tests, because, , these products have to survive for the lifetime of the building. And, the … the lifetime of a building is much longer than the lifetime of a car. So, , there’s, again, enhanced requirements around weathering and durability, which of course, we had to take into account when we designed the century glass. So we do a lot of natural weathering. We make laminates and put them out, , in the fields of Florida, where they get a lot of sunlight and humidity and salt air. We take, , laminates and we put them in Arizona, and use concentrated, , sunlight from mirrors to actually accelerate, , the weathering process. So there, it’s hot and dry, and you can simulate about a year’s worth of weathering in one month, , there. ‘Cause, … we have to do accelerated weathering, otherwise it would take forever to develop products. Um, we also recently got some, , certifications for use of the products in Russia, where they were tested, , to very low temperatures, of … , to … to deal with the climates, , in Russia. So, testing down to minus 60 degrees centigrade, , and to the … and … , under the Russian, , kind of applications. So, we do a whole barrage of weathering and durability tests to make sure, , there’s very little change in the properties, both the optical properties and the, , mechanical properties. So, you know, a … an engineer, then, can feel confident, when they do a design, that it’s going to last. And, … and last the lifetime of the building. In some of the emerging markets, um, they have different needs, , to the U.S. , a good example is the Middle East. Um, century glass has been specified for several m … major projects now, in, … in… in the, … in the Gulf, , region. And one of the … key reasons it’s been specified in the … in the Middle East is, … because of the requirements of very high temperatures, , associated with buildings in, , Abu Dhabi, and … and places like that. So, it’s another area where PVB tends to be challenged, , at the higher temperatures, to … to get the right kind of pe … , performance. Um … so, , a … the century glass was designed to work at higher temperatures and elevated temperatures. So we’re starting to see, , designers in those r … , regions, um … now start to select the product because of the knowledge they can … they can get performance, , at higher temperatures. So, that … that’s one … one example. Now, the nature of the industry is it’s global anyway, so you have an architect literally down the street from here, designing a building in Abu Dhabi. So, they tend to be in… takin’ the knowledge and the knowledge of the materials, and then, , driving the use of those in… in, , the emerging markets, as I say, such as … such as the Middle East. India’s another good example. That’s a … a market which has, … really just started to implement, , safety glass requirements in their construction, , industry. So, it’s, … , as the … , as the sort of, , high-end construction industry sta … starts to grow, in a … in a country like, , India, , they’re recognizing their need to have higher performance, , glass, safety performance. And again, … you know, a city like Mumbai has high temperatures, a lot of salt air, requires good durability and higher temperature performance. Um … so, we’re starting to see projects come, , in, , in… in countries like India, and it’s, … it’s starting from a very small base, but, , growing extremely rapidly. So, you know, we’ve expanded our teams there, to promote the product and get the right information and materials to the people, … in the industry.
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*******www2.dupont****/SafetyGlass/en_US/index.html?scr=metacafe_dupont_sentry_02 Structural glass systems are now designed with both load-bearing and mechanical performance as well as with aesthetic considerations. From floors and stairs to balcony railings and glass canopies, DuPont™ SentryGlas® is changing the way that glass is used in building projects.
Stephen Bennison, Senior Technical Associate DuPont™ SentryGlas®: So we really took a polymer that was designed very much from a single impact, … car windshield, which, … is designed to be very compliant. Again, if I … if I … if I look at this other sample, which is a PVB, … you can’t really flick it. You see it’s very flexible. … because it was essentially designed for that single … single event. The SentryGlas® is designed not only for one event, but multiple events. … and that’s really what differentiates it. It really increases the structural and mechanical performance beyond what you can do, … with … with PVB. And it’s really shifting the paradigm. , it’s very much changed the mindset of what can be done, , with laminated glass. And, , one of the most prominent, , engineers, , who designs with, … with glass, , globally, , made a comment recently, which, … I thought was very interesting… , interesting. He likened the development of SentryGlas® to the development of reinforced concrete. You know, in the early days of concrete, you had monolithic concrete, and it had certain design limitations. And when rebar was invented, and inca … , and incorporated, , within concrete, it totally changed the design paradigm and led to much more aggressive structural design with, … with concrete. So there was a big driver to put lots of glass in buildings just from an aesthetic and design point of view. But then you run up, … against a lot of hard engineering constraints. So what an architect wants to do and what an engineer will let them do is often two different things. And there’s a tension there. And that … that can be solved by the use of laminated glass in many, … kinds of applications.
Valerie Block, Architectural Marketing Specialist DuPont™ SentryGlas®: And we’re seeing glass used in really amazing building projects, where, , the glass might be used for overhead glazing. It may have different support conditions than what you’re traditionally looking at, whereby a frame is going to be, , put around the glass on all four sides. These days, you might see very minimal supports, bolts through the glass holding the glass onto the structural frame. And, all of this is really what’s new with exterior and interior glazing.
Stephen Bennison: If you’ve ever visited the Apple stores, … the Apple computer stores in, … in Soho and Fifth Avenue and there’s a bunch of others that have sprung up. The glass design, there’s a massive use of glass in … in those buildings. … you may have seen the cube on … on … on, … on Fifth, Fifth Avenue. And the glass stairs and the structural, … a lot of use of structural glass where glass is used an element to actually support a lot of the loads, … imposed, … on that structure.
Valerie Block: SentryGlas® has really expanded the use of … laminated glass in what are called structural glass railings. Could be a … a balcony. It could be a railing in a condo. And, it … it’s also a commercial application, which has found its way into baseball stadiums. So, many of the new baseball stadiums that are being designed, in terms of railings on upper tier decks, want to maximize the view of spectators onto the field. That’s the main goal. So, one way to do it is to eliminate a top metal rail. Well, the thing that really makes SentryGlas® so special in these applications gets to the glazing detail itself, which is basically only on the bottom edge. The stiffness of the interlayer creates a much better glass railing solution, and especially, if you consider the issue of post-glass breakage, where the glass will remain standing even if broken, serving as a barrier. Other issues around exterior glass railings get at the ability of the laminate itself to resist moisture penetration, as you might see in other interlayers that have been used in glass railings. So, the SentryGlas® interlayer is actually a better performer than other interlayers in an exterior environment. So, laminated glass is finding its way into structural glass railings … because designers are interested in it, but also because … in the 2009 version of the International Building Code, there is new code language which says that structural glass railings must utilize laminated glass. So it’s getting a push from both the designers as well as the building code officials themselves.
*******www2.dupont****/SafetyGlass/en_US/index.html?scr=metacafe_dupont_sentry_03 DuPont™ SentryGlas®, with its stronger, stiffer interlayers, has the strength to make buildings safer against threats of hurricanes, earthquakes or other severe wind and weather. The stiffer interlayer prevents glass breakage and shattering, which significantly reduces the risk of injuries.
Stephen Bennison, Senior Technical Associate DuPont™ SentryGlas®: So if you want to build, … let’s say, … a nice building in Miami with lots of, … … glass in there, again, to get the day lighting and everything, you have to deal with things like severe weather threats, such as hurricanes. So when you design a building in a hurricane, … area, you need to actually get a … a … a type of glass that’s … that can mitigate the threat of damage from severe weather. And laminated glass is one of … is … is … is one of the major solutions to mitigating threats, … from severe weather. So you’re in a hurricane, you get lots of strong winds, debris and glass often gets broken. And, … even though there may not be people there in the building, you want to protect the envelope of the building, keep the whole thing together. And it’s that tough plastic in the laminated glass, … that does that. So that’s one example, mitigating severe weather, … threats. Also, … looking at things like natural disasters, if you have earthquakes, for example. If you’re building in an earthquake zone, again if the building gets shaken, the glass can break easily, you want it to stay in place. And there you may have people present. So, … if the glass gets broken, this tough plastic holds the, … laminate together. And it tends to stay in the frame and not fall out of the building and cause, … cutting and piercing, … kind … kind of injuries. So, you … you … you … you’re basically solving the problem of the brittleness of the glass by relying on … on … on the plastic to, … to … to … to give you that safety, … performance.
*******www2.dupont****/SafetyGlass/en_US/index.html?scr=metacafe_dupont_sentry_04 In recent years, man-made threats to buildings have become a paramount concern for designers, architects and engineers. For building projects exposed to these risks, laminated security glass can be designed for blast-resistance to mitigate threats while still allowing for the desired aesthetic of glass.
Stephen Bennison, Senior Technical Associate DuPont™ SentryGlas®: And then there are other threats, … a lot of manmade threats to deal with, … these days, in – you know, in the forms of terrorism, for example. So if there’s, … … a security threat for the building, again, if you want to put a lot of glass in there, you might have to deal with; well, how do I mitigate the risk of a … , a bomb blast event? Or a … an attack from, … , a mob. Or, … somebody who might be, … wanting to attack the building with … with, … with rifles or … or … or, … or guns. So all those, … kinds of threats can be designed against by using, … laminated glass. In the bomb blast case, again, the blast will break the glass, but you want to hold that glass together. You don’t want the glass to fly in the building and hurt people. … you want to mitigate the pressure. And you want the whole thing to hold together so then you can evacuate the building. Again, you can’t do that with monolithic glass, which is just plain glass without, … the plastic there. So there are all the kinds of things where, … … an end user, an architect and a consulting engineer would partner together to try and get what they want aesthetically, but then provide something that’s safe and provides an engineering, … kind of function.
Valerie Block, Architectural Marketing Specialist DuPont™ SentryGlas®: So, I mean, DuPont, at every step, has really been involved in… putting forth this interlayer solution as an effective way of improving safety. So, we have handled issues around safety glazing, hurricane impact. We’ve worked with the government on bomb blast test programs, all designed, really, to protect people and property from the dangers that we face in society today.
property from the dangers that we face in society today.