What kind of shower room tempered glass is easy to explode

Posted by aihw on June 11th, 2021

What kind of shower room tempered glass is easy to explode

The automatic explosion of tempered glass without direct mechanical external force is called self-explosion of tempered glass. Self-explosion is one of the inherent characteristics of tempered glass.

There are many reasons for self-detonation, which can be briefly summarized as follows:

①The influence of glass quality defects

A. There are stones and impurities in the glass:

Impurities in the glass are the weak point of tempered glass, and it is also the place where stress is concentrated. Especially if the stone is in the tensile stress zone of the tempered glass, it is an important factor leading to the explosion.

Stones exist in the glass and have a different coefficient of expansion from the glass body. After glass tempering, the stress concentration in the crack area around the stone increases exponentially. When the expansion coefficient of the stone is smaller than that of glass, the tangential stress around the stone is in tension. The crack propagation that accompanies the stone is very easy to occur.

B. The glass contains nickel sulfide crystals

Nickel sulfide inclusions generally exist as small crystalline spheres with a diameter of 0.1-2 mm. The appearance is metallic. These miscellaneous inclusions are NI3S2, NI7S6 and NI-XS, where X=0—0.07. Only the NI1-XS phase is the main cause of spontaneous explosion of tempered glass.

The theoretical NIS is known to be at 379. At C, there is a phase transition process, from the high temperature state a-NIS hexagonal crystal system to the low temperature state B-NI trigonal crystal system, accompanied by 2.38% volume expansion. This structure is preserved at room temperature. If the glass is heated in the future, the a-B state transition may occur quickly. If these impurities are inside the tempered glass under tensile stress, the volume expansion will cause spontaneous explosion. If a-NIS exists at room temperature, it will gradually change to the B state after several years and months. The slow increase in volume during this phase change does not necessarily cause internal rupture.

C. The glass surface has defects such as scratches, blasting, and deep blasting due to improper processing or operation, which may easily cause stress concentration or cause the tempered glass to explode.

②The stress distribution in the tempered glass is uneven and the temperature gradient along the thickness direction of the glass when the offset glass is heated or cooled is uneven and asymmetric. Toughened products have a tendency to explode, and some produce "wind explosion" when they are chilled. If the tensile stress zone deviates to a certain side of the product or deviates to the surface, the tempered glass will explode spontaneously.

③The influence of the degree of toughening, experiments have shown that when the degree of toughening is increased to level 1/cm, the number of self-detonations reaches 20-25%. It can be seen that the greater the stress, the higher the degree of toughening, and the greater the amount of self-detonation.

Will the tempered glass used in the shower room explode?

Qualified shower rooms are made of toughened glass, which is based on safety considerations. If you use ordinary glass to make the shower room, once the glass is damaged, the glass fragments will be large-scale and large-volume fragments, which will cause great harm to the human body, cutting skin, muscles, blood vessels, etc.

It is very important to choose qualified toughened glass. The above-mentioned hazards can be completely avoided whether the glass is artificially broken or exploded. Although full tempering will increase the rate of self-detonation, the size of the fragments after bursting can be completely controlled within the scope of national standards. If semi-tempered, excessive fragments will cause serious harm to the human body.

At the same time, the shower room glass needs to be clamped by hardware. The semi-tempered glass is not only unable to reduce the spontaneous explosion rate due to its obvious decrease in firmness, but will increase the possibility of spontaneous explosion due to the fastening of the hardware.

In addition, the self-detonation rate of tempered glass generally refers to the self-detonation probability of tempered glass produced in the tempering plant, not the self-detonation rate of the user during use. Since the spontaneous explosion of tempered glass is its inherent characteristic, theoretically, this possibility cannot be ruled out. Although the use of high-quality tempered glass, the harm to the human body is limited to very light damage to the skin surface, but it is still recommended that users choose explosion-proof membranes, which can reduce the damage to the human body. The damage is reduced to zero!

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