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The damage method of single piece of fire-proof glass in the initial stage of incineration test is glass burst, which usually occurs in the first 15 minutes. Whether the glass burst in the initial stage of incineration is to confirm whether the single piece of glass has useful fire-proof function. After 15-20 minutes of incineration test, the temperature of single piece of fireproof glass rises, and the glass gradually begins to anneal to soften, which is the common feature of single piece of fireproof glass obtained by float glass reprocessing. With the extension of the burning time, the glass begins to soften and deform. At this time, the damage method of single piece of fire-proof glass is glass softening. Because of the gravity effect, the glass edge is separated from the device structure, resulting in the fire penetration failure of the fire-proof structure. Therefore, only the appropriate device structure is selected, and the glass is firmly fixed. Generally, high-strength fire-proof glass can reach the burning time of more than 90 minutes (level I specification). The larger the use standard of a single piece, the greater the self weight ratio deformation of the glass, and the fire prevention time of the glass will be shortened.

　　1. Generally, the surface stress of high-strength tempered glass is required to reach 170-250mpa. When the air-cooled tempering process is selected, the surface stress is difficult to reach 250Mpa. At this time, the glass deformation is severe, and even the glass surface shows cracks. The glass is easy to crack in the process of tempering. In order to obtain high surface stress, high wind pressure should be selected for tempering treatment, and the glass heating should be higher than the normal heating temperature, and the heating time should be properly extended, so as to fully clean the residual stress of the glass and help form the fire resistance function of high-strength tempered glass.

　　2. Chemical treatment of glass surface, chemical toughening, ion exchange is to make K + (potassium ion) with larger radius replace Na + (sodium ion) with smaller radius, and form 20-100 on the surface of glass μ M ion exchange layer, which can bridge the microcracks on the surface of the glass and improve the surface strength of the glass. Because the chemical toughened stress layer is very shallow, the pure chemical toughened glass does not have the function of fire prevention. However, the microcracks on the surface of the glass can be eliminated by chemical tempering, which improves the fire-resistant function of the high-strength tempered glass.

　　3. After high-strength toughened glass, there is self explosion phenomenon. If it is heated and self explosion in the process of use, it will directly affect the fire protection function. In the production of single piece of fire-proof glass, heat immersion treatment is generally required.

　　4. The device structure and device method of single piece of fireproof glass have a very important impact on its own fire-resistant function. The single piece of fireproof glass shall be tested together with the device structure. The device demand of single piece of fireproof glass shall fully consider the generation of thermal stress of the glass. The glass is heated to produce bending deformation, and the device structure can adapt to bending deformation and avoid the superposition of thermal stress and mechanical stress.

Article source: monolithic fireproof glass http://hanzhicheng.cn/