Float glass can contain nickel sulphide inclusions which can be more unstable after tempering. For this reason, spontaneous breakage after installation is a greater risk for tempered vs H/S or annealed glass. The heat soaking process, heating the finished product to at least 290 degrees C, can cause glass with inclusions to break in the chamber removing the risk for installed glass to create an unsafe installation site or costly replacement process.
While heat-soaked glass is not a guaranteed solution it greatly reduces the risk of spontaneous on-site glass fallout. This specific risk is removed by heat strengthening rather than tempering or by laminated alternatives but the chance of replacement is still present to some degree.
All of these options are products manufactured at Central Canadian Glass.