Additional strength in general glazing applications
Heat-strengthened (HS) glass has been subjected to a heating and cooling cycle and is about twice as strong as annealed glass of the same thickness and configuration. HS glass must achieve residual surface compression between 3,500 and 7,500 PSI for 6 mm glass, according to ASTM C 1048. Please contact Guardian regarding thicker glass standards.
HS glass has greater resistance to thermal loads than annealed glass and, when broken, the fragments are typically larger than those of fully tempered glass and initially may remain in the glazing opening.
Heat-strengthened glass is not a safety glass product as defined by the various code organizations. This type of glass is intended for applications that do not specifically require a safety glass product but additional strength is desired to withstand wind load and thermal stress. Please note that HS glass cannot be cut or drilled after heat-strengthening and any alterations such as edge grinding, sand blasting or acid etching can cause premature failure.
Our Advanced Architectural Glass is designed so it can be heat-strengthened by our network of independent SunGuard Select Fabricators. That means processing can be done more quickly and closer to your project site, for faster replacements and shorter lead times.