The tempered glass is considered a safety glass, as a thermal process increases its resistance 4 to 6 times more than a normal glass without altering its properties.
It is a process that consists in heating the glass gradually to a temperature close to its softening point between 575 °C and 635 °C and then cooling it abruptly with air. In this way the surface of the glass shrinks rapidly and is permanently subjected to compression stresses, while the interior of the glass is permanently subjected to tensile stresses.
Thanks to this process in the event of an accident, its fracture is presented as small particles of cubic form, providing security and protection to its users.