Tempered glass undergoes a special heat treatment, moreover, after cutting and drilling holes, since it is impossible to cut it after hardening. Tempered glass is three to four times stronger than ordinary glass in terms of its properties, and its appearance is no different.
The safety of this glass lies in the fact that, having a high internal stress, when broken, it breaks up into many small round-shaped fragments. These fragments do not have sharp edges and are practically safe for others. It is used in double-glazed windows, which are installed in places where increased safety requirements are imposed on windows, for example, when glazing facades, conservatories or windows equipped in the roof.