Heat soaking is a process required to assist identifying toughened glass that may explode later due to imperfections which are naked to the eye. After the safety glass has completed the tempering process, the panel is loaded into a heat soaking chamber and rests for a duration of time at around 300 degrees.

Exposing the glass to this temperature for a long duration will cause any nickel sulfide imperfections to enlarge, thus exploding the panel. This ensures that any panel that survives the chamber is extremely safe to install as balustrade or any area where zero risk is required.