At present, in order to reduce the weight of high-rise buildings and enhance the beauty of the facade, more and more glass curtain walls are used, but the ensuing safety problems are also more and more, which are mainly the curtain wall glass damage and fall injury accidents, and the curtain wall glass fire protection problems.
In order to make better use of glass curtain wall, safety glass is selected when glass is selected, and tempered glass is used in the past. But tempered glass has an inevitable characteristic is self-explosion, tempered glass self-explosion in curtain wall construction is very common, installed on the high-rise curtain wall if the tempered glass self-explosion is very dangerous. The cause of the self-explosion of tempered glass is the presence of nickel sulfide impurities in the glass, and nickel sulfide comes from mineral raw materials - feldspar, dolomite, limestone and so on. Ultra clear glass basically does not use mineral raw materials (except quartz sand), and uses chemical raw materials with higher purity, such as aluminum hydroxide, calcium carbonate, magnesium carbonate, etc., completely eliminate the existence of nickel sulfide, there is no internal cause of self-explosion, so there will be no tempering self-explosion. Ultra clear glass, also known as low-iron glass, reduces the dross and reduces the self-detonation rate by 10 times. As far as the self-detonation rate is concerned, the ultra-white glass is only three parts per thousand, far lower than the tempered glass three parts per thousand.
Therefore, it is very good to reduce the probability of glass self-explosion at the source. Practice shows that the glass curtain wall can use semi-tempered glass, which has a high strength and will not self-explosion, so as to reduce the risk of glass self-explosion fall off. According to the building fire protection requirements, the glass curtain wall should meet the fire protection requirements, and the fire resistance limit of the external wall is not less than 1h, which can not be met by the general glass according to the fire protection requirements. Fireproof glass should use composite fireproof glass, it has good fire resistance, its fire resistance limit is generally 1.0 ~ 3.0h, this kind of glass is used in high-rise buildings, to achieve a good fire effect.
The surface stress of semi-tempered glass is low, and self-explosion phenomenon will not occur. Due to thermal enhancement, the strength of semi-tempered glass reaches 2 times that of ordinary float glass, has a high ability to withstand temperature changes, and also greatly improves the impact resistance, which is not easy to be broken due to temperature mutations or artificial impact. Even if accidentally broken, its cracks do not cross, the radial cracks formed directly to the edge, because the edge of the glue seam bonding or the border clamping, the glass fragments are not easy to fall.
