Thermally tempered glass (ESG) is made of annealed glass. It can have sharpened, sanded, polished edges, with holes or recesses, as well as have heat control, or solar control coating. During the thermal treatment process, it is heated to a temperature of 620-650 °C and quickly cooled by compressed air. Huge internal stresses are formed in the glass, which makes tempered glass safer. If such glass breaks, it breaks into a large number of small pieces, thus reducing the likelihood of injury. Mechanical strength increases 5-6 times compared to annealed glass. The thermal resistance during operation does not change to the temperature of 250 °C. It is divided into two safety classes (EN12600):1(C)2 and 1(C)1.
Heat-strengthened glass (HST - Heat Soak Test) is made of thermally tempered glass. Thermally tempered glass is capable of spontaneous breaking/self-explosion due to the presence of inserts (particles) of nickel sulphide (NiS). The NiS particle is a rare, but naturally occurring insert during the manufacturing process of annealed glass, which, even after several years of operation of tempered glass, can cause spontaneous explosion. We recommend that in all situations where the self-breaking of thermally toughened glass may pose a risk to the structural stability and safety of people, to carry out a heat soak test (HST) for this glass. During this test, over 99 % of thermally tempered glass with NIS inserts is removed, but this test cannot eliminate 100 % of the glass at risk. During the test, the thermally tempered glass is placed in a heating chamber where it is heated to 290 °C and kept for at least 2 hours. During the keeping, the NiS particles expand and cause spontaneous breakage of thermally tempered glass.
Laminated glass (VSG) is produced by insetting a lamination film between two or more sheets of glass, which during the breakage prevents the glass slivers from falling off, thus providing protection against injury caused by glass slivers. It can be made of annealed, heat-insulating, solar conductivity-controlling, thermally tempered (ESG), tempered (TVG) glass, by combining various types of glass with each other. According to its structure and the amount of lamination films, it is divided into two safety classes (EN12600): 2(B)2 and 1(B)1. Due to its strength, can be used as antivandal protection.
Bulletproof/explosion-proof panes of glass. The layers of this glass effectively distribute the force of the bullet by spreading it evenly over the entire surface of the glass and, depending on the class of resistance, can withhold a shot or explosion. Glass is generally divided into BR_- S (S = splintering) fragments that leave on the inside and BR-NS (NS = Non-splintering) that does not leave fragments on the inside, ER-S (S = splintering) and (NS = Non-splintering), explosion-resistant ER-S (S=splintering) and (NS= Non-splintering) class panes of glass. Fireproof insulated glass units with bullet-proof glass may also be available.