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Do you know what kind of glass this man was using? So when he hit the side, the whole glass cracked but did not break. It is actually laminated glass, or coated glass, which consists of three layers of glass glued together with an interlayer, usually made of a material such as polyfinyl butyral. When the middle layer is struck, the cracks can spread evenly as the stress is distributed through the interlayer. This creates a uniform and controllable crack pattern, while at the same time these interlayers hold the broken glass together, allowing the glass to have an artistic and beautiful appearance.


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