To make tempered glass, float or decorative glass is heated to the temperature of 600°C (plasticity limit) and is then quickly cooled by air. Because the interior of the glass cools more slowly than the surface, the surface is placed under compression stress, while the interior is exposed to tensile stress.

In this way, we obtain glass that is characterized by excellent mechanical and thermal properties. In case of breakage, tempered glass breaks into a multitude of small fragments with rounded edges. After having been thermally toughened, tempered glass cannot be processed any further. Therefore, cutting, grinding and drilling must be done before tempering.

Tempered safety glass produced in our factory is tested and certified by Stazione Sperimentale Del Vetro of Venice. Its conformity to the European standards EN12160 and EN1863-1 is indicated by the CE mark.

To minimize the risk of spontaneous breakage
of heat-treated glass
caused by nickel sulphide inclusions,
called NiS breakages, the Heat Soak Test is used.
This process consists of placing glass panels inside a chamber
and subjecting them to a temperature of 290°C.

The Heat Soak Test is particularly required
on tempered glass used in single-glazed façades.