Why did the curtain wall glass burst

Now a lot of office buildings and residential buildings in order to look beautiful are with a large area of glass curtain wall, but in the absence of external forces in the case of some glass curtain wall will suddenly burst, a lot of people do not understand why? In order to achieve a certain strength of glass curtain wall, tempered glass is generally required. The reason why tempered glass curtain wall has high hardness and impact resistance is that strong compressive stress is formed on the surface of curtain wall glass after thermal processing by heating the tempered furnace.The existence of this stress, to a certain extent, offsets the impact ability from the outside, so it shows that the strength of the toughened curtain wall glass is high, and the greater the stress, the higher the strength of the toughened glass.

But this situation is an unbalanced state, as long as it is possible to always want to return to the balance – burst broken into pieces, this is the tempered glass burst broken. Curtain wall construction need to be payed attention. It is possible to break the balance and cause the tempered glass to burst and break. There are external and internal reasons. External causes mainly include excessive load, collision with harder objects, improper clearance (clearance is too small) and side damage; Internal factors include: (1) the edge of the tempered glass processing defects, sharp corners, holes and other stress concentration area stress is too large, (2) the internal stress of the tempered glass is too large, (3) the presence of nickel sulfide impurities in the tempered glass. The first two factors are caused by the process control in the process of toughened glass processing, and the nickel sulfide factor is produced in the process of raw glass production. Fragmentation caused by internal factors is called self-detonation. Self-explosion for toughened glass is not completely avoidable, but also without warning, the probability of its occurrence is usually in 3‰, western countries is low, and China is relatively high. The glass may contain nickel sulphide impurities in the form of small crystals, which normally do not cause damage to the frameless glass curtain wall.

However, due to the reheating of the toughened glass, the phase of the nickel sulphide impurities is changed. However, only relatively large impurities can cause self-detonation, and only when the impurities are at the core of the tensile stress can the tempered glass self-detonation occur. Curtain wall manufacturers should learn more information about curtain wall. Nickel sulfide can occur at any time after production, and the most typical time to cause the self-explosion of toughened glass is 4 ~ 5 years after the completion of production.