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Tempered glass is a safety glass required by fire codes for use in building façade systems. However, as previous studies were primarily focused on the ordinary float glass, little is known about the fire performance of tempered glass panels and the interaction between its fallout and enclosure fire dynamics. In this study, eight small-scale experiments investigated the influence of frame insulation conduction on the fallout behaviour of tempered glass. Tempered single-glazing panels, 815 × 815 mm2 and 6 mm thick, were installed in the front wall of a compartment with a dimension of 1000 × 1000 × 1000 mm3. The glass panels were heated by a square pool fire of 200 × 200 mm2, positioned at the compartment center. Glass frames were made of either stainless steel or insulated materials, and important parameters, including the fallout time, glass surface temperature, hot gas temperature, incident heat flux and heat release rate of pool fire, were recorded. The experiments showed that the critical temperature difference and heat flux of tempered glass are respectively around 340 °C and 46 kW/m2, which are significantly larger than those for float glass panels. The frame with higher thermal conductivity can increase the fire resistance of the glazing systems. The occurrence of glass fallout may cause unexpected ejected flame with a height of more than 2 m and has a significant influence on the fire growth, temperature distribution and neutral plane height in the compartment (i.e., the zero pressure plane). The results can deepen the understanding of glass fallout in fire and propose to provide the reference to glass façades fire safety design in practical engineering.
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