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How to prevent tempered glass from blasting during processing
The reason for the self-explosion after the tempered glass tempering is that in the process of manufacturing the glass, some nickel-containing impurities are mixed in the melt of the raw material or the refractory material, and these impurities are used to form nickel sulfide crystals in the glass melting process.

The nickel sulfide crystal has an α phase at a high temperature of over 380 ° C and a β phase at normal temperature. When the nickel sulfide crystal is changed from the α phase to the β phase, the volume of the crystal changes by 2-4%, and the diameter of the nickel sulfide crystal which causes the self-explosion of the tempered glass is about 0.2 mm. When the glass factory is molded into the original glass, a slow annealing process is required, and the nickel sulfide crystal does not substantially affect the strength of the glass. But when the glass is tempered, the situation is very different.

Since the tempered glass is a quenching process. Under the action of the cooling air, the glass cools very fast. When the glass is cooled to normal temperature and the structure is completely fixed, the α-phase nickel sulfide crystal is too late to be converted into the low-temperature β phase, but still exists in the high-temperature α phase. If the nickel sulfide crystals appear in the tensile stress region of the tempered glass, self-explosion will occur as long as the crystal transformation occurs.

Since the time of crystal transformation is variable, the self-explosion of tempered glass at normal temperature is completely uncertain. The detonation process reduces the probability of self-explosion. To solve the self-explosion of tempered glass, the tempered glass is homogenized: the tempered glass is reheated to 280-300 ° C, and then incubated for 2-4 hours, so that the tempered glass with conditional self-explosion bursts in the process.

The homogenization of tempered glass is also referred to as the detonation treatment of tempered glass or the hot dip treatment of tempered glass. According to the analysis of the glass factory, after strict homogenization treatment, the self-explosion probability of tempered glass will be greatly reduced, and the probability of one piece of self-explosion per 10,000 square meters of glass in one year is only 1% or less. The tempered glass at this time can be called a real safety glass.

What is glass tempered glass supplier?

Glass tempering is divided into physical tempering and chemical tempering. Physical tempering is common. Glass is obtained after passing high material in physical tempering furnace. Physical tempering is very effective for glass with thickness of 3 PCT and above. Semi-tempered glass, semi-tempered glass has a very small hardness compared to fully tempered glass, but its safety factor is also low. If the glass below PCT thickness can achieve full tempering effect, it must be tempered by chemical tempering. .

Chemical tempering is a simple low-temperature ion exchange of glass in an alkali salt solution of about 400 ° C. The chemical tempering is different from the physical tempering principle. Physical tempering is mainly used to strengthen the glass with a large thickness, and chemical tempering is used to strengthen the thin glass. Frequently used in chemical tempered glass products are mobile phone glass, display glass, scanner glass, printer glass, plasma TV glass, etc. Chemical tempering is not necessarily only tempered thin glass, and high-thickness glass can also be fully tempered. The advantage is that the steel is flexible, suitable for glass of different sizes, different thicknesses and different shapes, and the processing range is 0.3-19 mm. The surface is smoother than the physical tempering, the light transmittance is better, and there is no self-explosion phenomenon. .