Small Sizes UPVC Casement Window

Small Sizes UPVC Casement Window

The distribution of stress in tempered glass is that the two surfaces of tempered glass are stress, the core layer is tensile stress, and the stress distribution in the thickness of glass is similar to parabola.

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Self-exploding Solutions of tempered glass:

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Reducing stress value

The distribution of stress in tempered glass is that the two surfaces of tempered glass are stress, the core layer is tensile stress, and the stress distribution in the thickness of glass is similar to parabola. The center of glass thickness is the apex of parabola, i.e. the maximum tensile stress; the stress is near the two surfaces of glass on both sides; and the zero stress surface is about one third of the thickness. By analyzing the physical process of tempered glass quenching, it can be seen that the surface tension of tempered glass is roughly proportional to the maximum internal tension stress.

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American standard ASTM C1048 stipulates that the surface stress range of tempered glass is greater than 69MPa, and that of semi-tempered (heat-reinforced) glass is between 24 MPa and 52 MPa. The curtain wall glass standard BG17841 stipulates that the semi-tempered stress range is 24 <; delta < 69MPa. The new national standard GB15763 implemented by China. 2-2005 "Safety Glass for Construction Part 2: Tempered Glass" requires that the surface stress should not be less than 90 MPa. This is 5 MPa lower than the 95 MPa stipulated in the old standard, which is conducive to reducing self-explosion.

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Uniform stress

The uneven stress of tempered glass will obviously increase the self-explosion rate, which can not be ignored. The self-detonation caused by uneven stress is sometimes very concentrated, especially in a specific batch of bend tempered glass, the self-detonation rate will reach an alarming degree, and may occur continuously.

Hot dip treatment

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Hot dipping treatment is also called homogenization treatment, commonly known as "detonation". Hot-dipping treatment is to heat tempered glass to 290 +10, and keep it warm for a certain time, so that nickel sulfide can quickly complete the crystal phase transformation in tempered glass, so that the tempered glass which may self-explode after its original use can be artificially broken in the hot-dipping furnace of the factory in advance, thus reducing the self-explosion of tempered glass in use after installation. 

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