Safety glass (tempered), called the crystal has undergone hardening heat treatment (toughening or tempering), which improves the mechanical strength and heat resistance, while acquires secure fracture properties. This means that if a tempered glass break, shatter into small, relatively harmless pieces, that are not as large or sharp to cause serious injury. Advantages of heat-treated glass: Improved mechanical strength: the heat treatment improves both the load resistance, and the resistance of glass to impact. The tempered glass is almost 5 times more powerful than the usual plain glass. Increased heat resistance: The tempered glass, remains stable and retains its characteristics at temperatures of from -70 ° C up to + 295oC. Even withstand temperature gradients, such that the one side is at the 250th and the other at ambient temperature. Secure snap: Because the glass is tempered by high surface tension, if broken, it releases all the accumulated energy and as mentioned above, crushed to a large number of small, relatively harmless pieces. There is a wide range of applications where it may be used the thermally tempered glass. The high mechanical strength and safe breaking features is ideal for use in safety critical applications such as doors, windows, glazing at low altitude. It is also suitable for desks, benches, furniture bathroom cabinets. The properties of tempered glass is often necessary in the following applications: agricultural machinery, cranes, caravans, trains, squash, telephone booths etc. In addition to all of these applications, the Glass Industry Security has developed specially tempered glass products for industries producing solar panels. In the EU compulsory use of tempered glass.