To prevent this glass is tempered, or heat-strengthened. This process strengthens the glass to improve its resistance to extreme heat or cold. If the glass does break, it breaks into small pieces rather than large, dangerous shards. It’s the same process used in auto glass to mitigate risks in accidents.
Binswanger Glass installed the high-performance curtain wall system featuring Guardian SunGuard SNR 43 in the Allscripts Office Tower in Raleigh, North Carolina. Photo courtesy of Binswanger Glass
Manufacturers have also developed techniques to strengthen glass for other uses. After Hurricane Andrew caused billions of dollars in damage in 1992, building codes changed drastically. Back then, high winds shattered windows and water rushed in, causing extensive damage to homes and buildings. Authorities began to require laminated glass in these areas to prevent such outcomes. Laminated glass features a plastic or vinyl inner layer that holds the glass in place in case of breakage.
Furthermore, using silicone or different types of gaskets seals the gap between the window and the frame, helping hold the broken glass in place. These techniques are also used to create bullet-resistant glass, which contains a polyvinyl inner layer surrounded by multiple layers of glass. All of these innovations lead to higher quality, longer lasting, safer glass in our spaces.