Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Laminated safety glass with DuPont™ SentryGlas® interlayer shows no sign of aging after five years

11.11.2011
Administrative headquarters of Deutscher Ring in Hamburg: Laminated safety glass with DuPont™ SentryGlas® interlayer shows no sign of aging after five years
Laminated safety glass with high strength, high stiffness DuPont™ SentryGlas® interlayer shows no significant signs of aging despite five years of exposure to the rough climate of northern Germany. This was the expert opinion of the independent consulting engineers Kallinich o.b. u. v. HK Hamburg, who - as part of a predetermined long-term inspection - removed ten panels from the glass facade of the administrative headquarters of Deutscher Ring Lebensversicherungs-AG in Hamburg and replaced them with reserve panels set aside for such circumstances. Comprehensive tests were carried out on the removed panels, the results of which were compared with data recorded with new panels.

"After five years of use and almost constant exposure to water spray, we found no sign of hazing, delamination or edge defects on any of the panels, not even at their edges," comments the surveyor Dietmar Kallinich. "Flexural load testing, carried out at the high wind loads typical for buildings in such a location, revealed the same low rate of deflection we would expect to achieve with brand new panels. This indicates that the special ability of SentryGlas® interlayer to transfer shear loads, for even greater safety, is retained despite its long-term exposure to these particularly demanding conditions. The post-breakage strength of the laminated glass panels - a very important factor in terms of the safety of passers-by - remains consistently high."

An almost perfect transmission of load
An important criterion for the use of laminated glass in facade applications is the no-sag behavior of the interlayer when exposed to moisture. The SentryGlas® interlayer is non-hydroscopic and, in comparison to standard PVB interlayers, is over 100 times stiffer and five times stronger. This means that there is an almost perfect transmission of load between the laminated plies of glass. As a consequence, laminates with SentryGlas® exhibit less than half the rate of deflection of comparable laminates made with standard PVB interlayer under the same load, behavior that is close to that of monolithic glass panels of the same thickness. These properties remain largely the same and stable over a temperature range of between–15 °C and +50 °C. It is on the basis of these properties, and following comprehensive testing, that the Deutscher Ring project gained the building authority approval they required - at that time only granted on a case-by-case basis - for the use of laminated safety glass with SentryGlas® interlayer. A mandatory inspection of the laminated glass after 5 and 10 years respectively formed part of this approval.

This regulatory approval enable the continued use of the existing support structure, made from aluminum fittings, that had been designed for use with toughened safety glass panels with a thickness of up to 12 mm. The only requirement was a redesign of the mounting brackets. The common alternative to toughened safety glass at the time, a laminate with standard polyvinyl butyral (PVB) that is unable to transfer such high shear loads, would have been too heavy for the existing support structure. Instead, the operating company for the building was able to cost-efficiently gain a significant improvement in safety with its "lightweight" glazing solution consisting of two plies of 6 mm heat-strengthened glass and a 1.52 mm interlayer. Post-breakage strength of the laminate is increased, with the panels remaining securely intact within their fixings.

Additional benefits for budgets and the environment
In 2009 laminated safety glass with SentryGlas® interlayer received general approval for use in construction in Germany. This means that architectural glazing produced with this material involves no additional bureaucratic expense, thereby vastly extending its potential for use. Today, laminated safety glass with SentryGlas® is used for architectural projects around the world such as glazed balustrades, flooring, stairways and pedestrian bridges. Its adoption helps reduce transportation costs too, due to the fact that a laminated glass panel with SentryGlas® interlayer is approximately one third thinner and lighter than a panel of the same performance made with a PVB interlayer. Moreover, it is often the case that glass construction companies are able to use standard lifting equipment when handling laminated safety glass with SentryGlas®, whereas heavy panels with a PVB interlayer may well require the services of a specialized company.

DuPont Glass Laminating Solutions provides manufacturers and the specifiers of laminated glass access to materials, services, and innovative processes which contribute to a better world. Buildings are better protected, vehicles made safer, and constructions are more stable and energy efficient with more natural light being introduced into them.

DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment.

The DuPont Oval, DuPont™ and SentryGlas® are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates.

Note to the editor:
This press release is based on information provided by:
Ingenieurbüro Kallinich IBK
Waldweg 18, 22393 Hamburg, Germany
Telephone: +49 (0) 40 6 02 48 43
E-Mail: info@kallinich-ibk.de
Contact: Dietmar Kallinich
www.kallinich-ibk.de
Editorial contact:
Birgit Radlinger
Tel.: +49 (0)6102 18-2638
Email: Birgit.Radlinger@dupont.com

Birgit Radlinger | DuPont
Further information:
http://www.safetyglass.dupont.com
http://www.dupont.com

Further reports about: DuPont PVB SentryGlas® SentryGlas® interlayer laminated glass

More articles from Architecture and Construction:

nachricht Flexible protection for "smart" building and façade components
30.11.2016 | Fraunhofer-Institut für Silicatforschung ISC

nachricht Healthy living without damp and mold
16.11.2016 | Fraunhofer-Gesellschaft

All articles from Architecture and Construction >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>