Through the heat curing process, the base layer of glass pane 3 is given excellent characteristics. Firstly, the thermally cured glass pane acquires four to five times the tensile strength of glass of the same thickness without additional heat treatment and can therefore withstand much higher mechanical stresses.
Also, the heat treatment hardening process makes the glass more resistant to extreme, short term changes in high and low temperatures, and at the same time more able to withstand large temperature differences within its mass.
However, if failure occurs due to high loads, then the glass pane will shatter into a mass of non-sharp, loosely bonded pieces, which pose less of a threat of injury than the sharp, large breakage pieces of a glass pane without additional heat treatment.