Date: 17 October 2013
Rinehart, DuPont Glass Laminating Solutions North America protective glazing marketing manager. “Based on the results, we believe SentryGlas® and Butacite® in the Kawneer system can provide the most stringent and affordable hurricane mitigation protection options available in North America.”
Based on Kawneer’s testing and qualification, 60-mil thick SentryGlas® can be used for large missile impact resistance for winds up to 110 mph in Wind Zone 3, as defined by the American Society of Testing and Materials E1996 standard. 90-mil thick SentryGlas® is qualified for dry glazed systems intended for use in the High Velocity Hurricane Zone (HVHZ), primarily Miami-Dade and Broward Counties. 120-mil and 180-mil SentryGlas® thicknesses are qualified and tested to design pressures up to 130 pounds per square foot (psf) for essential and non-essential facilities in the HVHZ and elsewhere.
DuPont™ 60-mil thick Butacite® PVB also is qualified in Kawneer’s 1630 SS IR Curtain Wall System for small missile resistance as required by ASTM E1886 and ASTM E1996, the ASTM test method and specification that address performance of exterior windows, doors and curtain walls installed in geographic regions that are prone to hurricanes.
For decades, interlayers made of polyvinyl butyral (PVB) have been the industry standard when producing laminated safety glass. Architects are well aware of the possibilities and limitations of such glass when used extensively in façade engineering, for roofing and window panels.
In contrast, SentryGlas® enables an entirely new approach because the interlayer is over 100 times stiffer and five times stronger than PVB. As a consequence, there is an almost perfect transmission of load between two laminated sheets of glass, even at high temperatures, leading to the excellent flexural behavior of the glass when under load – also under direct sunlight in high summer. Accordingly, laminates with SentryGlas® show less than half the rate of deflection when compared to laminates with PVB, when under the same load, and thus almost the same behaviour as monolithic glass of the same thickness.
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. For additional information about DuPont and its commitment to inclusive innovation, please visit www.dupont.com.
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