What is semi-tempered glass?
Semi-tempered glass is also called heat-enhanced glass. Semi-tempered glass is a variety between ordinary flat glass and tempered glass. It has some advantages of tempered glass. For example, the strength is higher than that of ordinary float glass, which is twice that of ordinary float glass. At the same time, it avoids the flatness of tempered glass. Poor, easy to self-explosion, once destroyed, the overall crushing and other unsatisfactory shortcomings. When semi-tempered glass is damaged, it is cracked radially along the crack source, and there is generally no tangential crack propagation, so the whole can still be maintained without collapse after destruction.
Monolithic semi-tempered glass (heat-reinforced glass) does not belong to safety glass, because once it is broken, large fragments and radial cracks will be formed. Although most fragments have no sharp corners, they will still hurt people and cannot be used for skylights and occasions where human impact may occur.
The difference between tempered glass and semi-tempered glass
Tempered glass is annealed glass through high temperature and quenching, the surface of the formation of a strong compressive stress, so that the mechanical strength of the glass several times increased, that is, tempered glass. Tempered glass surface stress: 69~168 Mpa. It is characterized by small obtuse angle particles after rupture, which will not cause major harm to the human body. The strength is 4 times and above the strength of ordinary glass. It has good thermal stability, and the temperature difference that ordinary glass can withstand after tempering is about 180°C. The disadvantage of tempered glass is easy to explode and poor flatness.
Semi-tempered glass is annealed glass through high temperature and quenching, the surface of the formation of a compressive stress below 69 MPa, so that the mechanical strength of the glass increased several times, that is, semi-tempered glass. Semi-tempered glass surface stress: 24-69 Mpa. After its broken and ordinary glass, the product is characterized by the strength of semi-tempered glass is more than 2 times that of annealed glass. Safety: When the broken fragments are radial, each fragment extends to the edge, not easy to fall off, safer, but does not belong to the safety glass. Deflection: The deflection of semi-tempered glass is smaller than tempered glass and larger than annealed glass. Thermal stability: thermal stability is also significantly better than annealed glass, ordinary glass after semi-tempered treatment can withstand the temperature difference of about 75°C. Semi-tempered glass will not self-destruct.
The use of semi-tempered glass
Semi-tempered glass is suitable for curtain walls and exterior windows in buildings, and can be made into coated glass, and its image distortion is better than tempered glass.