[China Glass Net] The burst of tempered glass without mechanical external force is called self-explosion .
The expansion of nickel sulfide inside the tempered glass is the main cause of the self-explosion of the tempered glass, which is mainly brought in by impurities in the glass raw material. Some nickel sulfide particles change their crystal structure from the α state to the β state over a period of time, during which the volume of the nickel sulfide particles expands to a large extent. This volume expansion process causes the strong internal stress of the tempered glass, which causes the tempered glass to self-explosion. According to the state regulations, the self-explosion rate of tempered glass is 3‰.
There are several factors affecting glass burst : 1. Glass damage factors: glass surface and edge are damaged due to handling, installation and maintenance, causing blasting, surface corrosion, chipping, etc., which are easy to damage the tempered glass. The self-explosion of the glass.
2. Installation factor: During the installation process, if the installation clearance is small or the glass is directly in contact with the frame, the expansion coefficient of the glass and the frame is different under the illumination of sunlight, and it is easy to cause the pressing force at the edge or the corner of the glass. , induced tempered glass burst.
3, glass processing factors: drilled or chamfered tempered glass is prone to burst.
4, natural factors: strong typhoon and other wind disasters lead to failure of wind pressure design, can cause tempered glass burst.
Tempered glass is a safety glass confirmed by regulations. It is widely used in places with high requirements on mechanical strength and safety, such as glass doors, building curtain walls, facade windows, interior partitions, furniture, close to heat sources and hot and cold impacts. The partition. The characteristics of tempered glass determine that self-explosion is unavoidable, and it is impossible to estimate the time and conditions of self-explosion. Therefore, in order to prevent the damage caused by the self-explosion of tempered glass, some measures or methods are often taken during glass processing and installation. To reduce the loss caused by the self-explosion of tempered glass.
1. Hot dip treatment: the tempered glass is placed in a hot dip furnace for heating, heat preservation and temperature reduction treatment, so that the nickel sulfide in the tempered glass reaches a stable state, and the stress inside the glass is balanced to achieve a lower self-explosion rate. the goal of. Advantages: The self-explosion rate is greatly reduced, the cost is low, and the glass specifications and layout are not changed. Inadequacies: Self-explosion cannot be completely ruled out, and the stress will be reduced accordingly.
2, laminated glass: PVB interlayer film between the glass, made by high temperature and high pressure processing. The toughness of the PVB film is very good. When the laminated glass is broken by external force, it can absorb a large amount of impact energy and rapidly attenuate it, so the laminated glass is difficult to penetrate and maintain excellent integrity. This allows buildings with laminated glass to remain in the frame of doors and windows even in the event of explosions, windstorms, earthquakes, etc., even if the glass is broken, protecting the inside and outside of the building from splashing glass fragments, wind and rain. Other foreign objects are also difficult to cause damage to the interior. The shortcomings are: 1) the weight of the glass increases the load and load of the building; 2) the escape is not conducive to escape and rescue; 3) increase the construction cost.
3, film glass: high-performance polyester film on the glass. Polyester film is commonly known as safety explosion-proof film. When glass breaks for various reasons, it can stick to glass fragments to prevent splashing. It protects people inside and outside the building from splashing glass fragments. Wind and rain and other foreign objects are also difficult to damage indoors. . The safety explosion-proof membrane can be connected to the frame-side system together with the organic glue to form a glass film protection system to prevent falling. Advantages: Easy to process, without changing the glass specifications and layout. Inadequacies: increase the construction cost.
4, enclosure design: set up guardrails in crowded places to prevent damage caused by glass fragmentation.
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