Ordinary glass appeared in ancient Egypt, and who was the inventor of this popular and useful material is no longer known, as well as unknown who invented the wheel. But if we consider the history of how tempered glass appeared, then there is a clear pattern of how the most ordinary materials evolve under the influence of the needs of civilization.
As a result of the research, SSG engineers in 1929 developed a special technology in which glass warmed up above the softening temperature and then rapidly cooled by jets of cold air. As a result of this procedure, the outer surface of the glass was cooled much faster than the inner surface and this gave rise to the residual compressive stress in the inner layers of the glass. Due to this residual stress, glass acquires a higher resistance to mechanical damage, and in the case of damage, again due to the fact that there is excess stress in the glass, it breaks into many small fragments that do not have sharp edges that are formed when ordinary glass is damaged. Such special equipment as a glass tempering furnace was developed in the USA in the fifties, and from there the technology of mass production of tempered glass was transferred to the whole world.
At the first stage of production, a special mixture is prepared, from which glass is finally obtained. This mixture is diluted with water and put into the oven, where excess impurities are removed from the mixtu
re. After that, the prepared mixture, which is already free from excess impurities, is heated to a temperature of 1500 degrees and cooled to the required level of viscosity. The resulting viscous glass is pulled through a tin bath. During this process, the viscous mass of glass spreads over the surface of the tin, acquiring a uniform thickness. Next, the glass is , at which it cools slowly and turns into the final product ready for use.
Today, the production process described above is automated and, thanks to the availability of special equipment, it is quite simple to set up the production process for the production of tempered glass. Moreover, modern reality imposes tempered glass and modern requirements that contribute to the production of completely new materials from tempered glass, for example, such as building triplex. Therefore, if today we talk about setting up the production of purchased glass, it means talking about the production of a fairly extensive range of materials for various purposes.
