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With the development of technology, there are already various methods to produce compressive stress on the surface of glass and enhance its physical properties. However, people are accustomed to calling heat-treated glass "tempered glass," while glass made through other forms is referred to as "strengthened glass." The principle of heat-tempered glass is to form compressive stress on the surface of the glass by heating and rapid cooling, thereby offsetting some of the external forces applied to the glass.
Architectural tempered glass is a type of prestressed glass that is tempered to improve the glass's strength and load-bearing capacity. It can also enhance the glass's resistance to wind pressure, temperature extremes, and impact performance, greatly expanding the application range of glass, especially in the field of doors and windows.
First, ordinary annealed glass is cut to the specified size and then heated in a furnace to near the softening point (670-720°C). Through its own deformation, internal stresses are eliminated. The glass is then taken out of the furnace, and high-pressure cold air is blown onto both sides of the glass using multiple nozzles, causing the surface of the glass to shrink rapidly and form compressive stress. The central area of the glass cools more slowly, forming tensile stress, which gives the glass higher strength. Generally, the higher the cooling intensity, the greater the strength of the glass.
Compared with ordinary non-tempered glass, architectural tempered glass has extremely superior mechanical strength. The impact strength of architectural tempered glass of the same thickness is 3-5 times that of ordinary glass, and its bending strength is 3-5 times that of ordinary glass, making it very safe in construction engineering applications.
Architectural tempered glass has prestressed characteristics, improving its original brittleness. Even if broken by external force, it will only shatter into granule-like fragments without sharp edges, greatly reducing the threat to human safety.
Architectural tempered glass has excellent thermal stability. Its thermal resistance is 3-5 times that of ordinary non-tempered glass and can withstand temperature differences of over 250 degrees, effectively preventing glass explosion.
