What is semi-tempered glass
Semi-tempered glass is also called heat-enhanced glass. Semi-tempered glass is a kind of product between ordinary flat glass and tempered glass. It has some advantages of tempered glass, such as higher strength than ordinary float glass, which is twice that of ordinary float glass, while avoiding toughened glass. Flatness is poor, easy to blew, once the damage is the overall smash, etc. is not as good as shortcomings. When the semi-tempered glass breaks, it radially cracks radially along the crack source. Generally, there is no tangential crack propagation. Therefore, under the general conditions, it can still maintain the overall collapse.
Monolithic semi-tempered glass (heat-reinforced glass) is not classified as safety glass. Once broken, it will form large fragments and radial cracks. Although most of the fragments do not have sharp sharp corners, they will still hurt and cannot be used in sunroofs. Occurrence of human body impact.
The difference between tempered glass and semi-tempered glass
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 tempered glass surface stress is: 69~168Mpa. It is characterized by broken small obtuse particles, which will not cause serious 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 self-explode and has poor flatness.
Semi-tempered glass is annealed glass through the high temperature and quenching, the surface layer forms a compressive stress of less than 69MPa, so that the mechanical strength of the glass increases several times, namely semi-tempered glass. The surface stress of semi-tempered glass is 24~69Mpa. Its broken and ordinary glass, the product is characterized by the strength of semi-tempered glass is more than twice the annealed glass. Safety: The fragments are radial when broken, each fragment extends to the edge, not easy to fall off, safer, but it does not belong to safety glass. Deflection: Semi-tempered glass has a greater deflection than tempered glass than annealed glass. Thermal stability: The thermal stability is also significantly better than that of the annealed glass, and the temperature difference that the ordinary glass can withstand after being semi-tempered is about 75°C. Semi-tempered glass will not blew.
The use of semi-tempered glass
Semi-tempered glass is suitable for curtain walls and exterior windows in buildings. It can be made into coated glass, and its image distortion is better than that of tempered glass.