There are several methods to distinguish between tempered glass and regular glass. Here are some practical techniques: 1) Use polarized sunglasses. Tempered glass often shows visible color patterns or markings when viewed through them, while ordinary glass does not. 2) Tilt the glass at different angles. Tempered glass may show slight surface distortions or irregularities due to the manufacturing process. You might notice uneven reflections or a wavy appearance across the entire surface. 3) Examine the edges. Tempered glass tends to have a slightly curved or softened edge compared to flat-edged regular glass. When looking at the side, you might see an oval-shaped gap in the middle, which is a common sign of tempering. 4) Check the flatness. Tempered glass is generally less flat than regular glass. A simple test is to place two pieces of glass face-to-face vertically. If there are small gaps along the edges, especially in an arc shape, it likely indicates that the glass has been tempered. Make sure to hold them face to face, not back to back. Another method involves using a mirror under sunlight — tempered glass will reflect a "flower-like" pattern, whereas regular glass will not. 5) Look for tempering marks. Tempered glass often has a special high-temperature ink printed on its surface during the tempering process. This mark is fused into the glass and cannot be easily removed without chemical treatment, such as hydrofluoric acid, which would still leave visible traces. 6) Test the hardness. Use a sharp object to gently scratch the edge of the glass (preferably in an area that won’t be visible after installation). If the glass scratches easily, it’s likely not tempered. Tempered glass is much harder and resistant to scratches. 7) Observe how the glass breaks. If you break a piece of tempered glass, it will shatter into small, round particles rather than sharp, jagged shards like regular glass.
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Method for identifying tempered glass and ordinary glass
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