“Semi-tempered glass”

Semi-tempered glass

Semi-tempered glass, also known as Heat-Strengthened Glass, is similar to the production process of tempered glass. After heat treatment (heating to a temperature of about 600 °C), the temperature is controlled by a gentle cooling curve. To improve the strength of glass, it is a kind of between ordinary flat glass and tempered glass. It has some advantages of tempered glass, such as higher strength than ordinary float glass, which is 1~2 times that of ordinary float glass. The thermal shock resistance is significantly improved, and at the same time, the flatness of the tempered glass is avoided, and it is easy to self-explosion. Once destroyed, the overall crushing is not as good as the weak point. After the semi-tempered glass is broken, the fragments are similar to ordinary glass, showing through cracks, and will not form small fragments in the closed state at the center of the glass, and will not fall off the building. This is true for architectural glass. Very important. It avoids the danger of broken pieces of glass falling from the air to the ground. use

Tempered glass is suitable for curtain wall and exterior windows, automatic doors and escalators in buildings. It can be made into tempered coated glass, and its image distortion is better than tempered glass. "Management Safety Glass Management Regulations" clearly states that "single piece of semi-tempered glass (heat-reinforced glass) is not a safety glass", because once it is broken, large fragments and radial cracks are formed, although most of the fragments do not have sharp sharp corners. However, it will still hurt people and cannot be used in skylights and occasions where human impact may occur. use

Tempered glass is suitable for curtain wall and exterior windows, automatic doors and escalators in buildings. It can be made into tempered coated glass, and its image distortion is better than tempered glass. "Management Safety Glass Management Regulations" clearly states that "single piece of semi-tempered glass (heat-reinforced glass) is not a safety glass", because once it is broken, large fragments and radial cracks are formed, although most of the fragments do not have sharp sharp corners. However, it will still hurt people and cannot be used in skylights and occasions where human impact may occur.

Distinguish from fully tempered glass

Semi-tempered glass is an annealing glass that passes through high temperature and quenching, and the surface layer forms a compressive stress of less than 69 MPa, which increases the mechanical strength of the glass several times, that is, semi-tempered glass. The surface stress of the semi-tempered glass is 24 to 69 Mpa. After being crushed, like ordinary glass, the product is characterized in that the strength of the semi-tempered glass is more than twice that of the annealed glass. Safety: The fragments are radial when broken, each piece extends to the edge, is not easy to fall off, is safe, but is not a safety glass. Deflection: The deflection of semi-tempered glass is larger than that of tempered glass. Thermal stability: The thermal stability is also significantly better than that of annealed glass. The temperature difference that ordinary glass can withstand after semi-tempering treatment is about 75 °C. Semi-tempered glass will not blew. Tempered glass is annealed glass through high temperature and quenching, the surface layer forms a strong compressive stress, so that the mechanical strength of the glass is increased several times, that is, tempered glass. The surface stress of tempered glass is 69-168 Mpa. It is characterized by broken small obtuse-angle particles after rupture, which will not cause significant harm to the human body. The strength is 4 times or more of the strength of ordinary glass. It has good thermal stability and can withstand a temperature difference of about 180 ° C after ordinary glass tempering treatment. The disadvantage of tempered glass is that it is easy to blew. technical standard

The surface compressive stress of the semi-tempered glass is between 24 MPa and 52 MPa, and the surface compressive stress of the tempered glass is greater than 69 MPa. The production process of semi-tempered glass is the same as that of tempered glass. The wind pressure is different only in the quenching station, and the cooling energy is smaller than that of tempered glass. Execution standard: GB 15763.2-2005 Safety glass for building Part 2: Tempered glass? GB/T 17841-2008 Characteristics of semi-tempered glass

1. Semi-tempered glass of the same thickness, its strength and temperature change bearing capacity is about 1~2 times that of ordinary glass. 2, still have ordinary glass characteristics, such as hardness, ductility and polarization, corrosion resistance. 3. When the semi-tempered glass breaks, it is a large piece of debris. The influencing factors are the applied strength, the fracture position and the glass temperature. 4. Compared with tempered glass, semi-tempered glass is less likely to be naturally broken. 5, after semi-tempered glass can not be cut, drilling, edging, sand blasting, acid etching and other processing. Precautions

1. The glass that is too thick cannot be semi-tempered (the thickness is about 10mm). 2. Semi-tempered glass is a kind of glass product with internal stress. It can not be cut, drilled and edged after molding, otherwise it will cause cracking. 3. The stress at the edge of the semi-tempered glass should be well protected. Do not hit the edge of the glass with a sharp, hard object weight, otherwise it will easily break the glass.