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The canopy is a kind of building assembly that is located above the entrance or top balcony of a building to protect it from rain and air damage. Generally choose two kinds of steel and adhesive. The tempered glass is a common glass that is uniformly heated. When approaching the softening point, it is evenly cooled according to different thicknesses at the corresponding cooling speed. The interior of the glass produces a strong permanent internal stress, and the tension stress of the inner layer and the pressure stress of the outer layer are in a stable stress balance state. The original physical properties of the glass are changed, the original performance of the glass is overcome, and the security of the used and laminated glass is increased. Due to the adhesion of plastic lining in the middle, when the glass is broken, the debris does not fly away, only radiating cracks are produced, and it is safe and not harmful. Therefore, it is widely used in the windshield of a car. At the same time, the impact strength of laminated glass is much higher than that of ordinary glass, and it is not easy to be broken when hit. In addition to the above properties, the laminated glass has a unique anti-theft effect. Because it is not easy to break into, it is relatively safe.