Generally, the sharp blade-shaped sharp corners of ordinary glass are easy to cut children or impacters, causing personal injury. After the glass is broken, it becomes a small particle or a knife. This is the main difference between tempered glass and ordinary glass. However, in engineering inspections, it is unrealistic to use such destructive tests. So how can you know if you are buying tempered glass? Here are some points summarized by Haihua Xiaobian. See if you can solve your problem.
This has to be analyzed from the principle of tempered glass. The tempered glass is obtained by first cutting the ordinary annealed glass into the required size, then heating it to a near softening point, and then performing rapid and uniform cooling. After tempering, the surface of the glass forms a uniform compressive stress, while the inside forms a tensile stress, which greatly improves the performance of the glass. The tensile strength is more than three times that of the latter, and the impact resistance is more than five times that of the latter. It is also this feature that the stress characteristic is an important sign to identify true and false tempered glass, that is, tempered glass can see colored stripes on the edge of the glass through the polarizing plate, while black and white can be seen in the surface layer of the glass. Interphase spots. Polarizers can be found in camera lenses or glasses, and attention is paid to the adjustment of the light source during viewing, which makes it easier to observe.
Then there is a general manufacturer, and each piece of tempered glass has a 3c quality safety certification mark.
The above is too cumbersome, so now it is easier to understand, with polarized sun eyes, you can see the colored markings, which should not be seen without tempering. Turning the angle, in fact, is also to see if there is wind pressure on the glass surface. You will see irregular deformation of the glass on the entire surface. Look at the side is supposed to be, when the glass is tempered, it will soften, and the flatness will be worse because of the roller path. When facing the face, the gap in the middle is an ellipse, so it is obvious. The flatness of tempered glass is worse than that of ordinary glass. The simple method: hold the two glasses face-to-face vertically together, observe the two long sides of the two pieces of glass, and see if there are any obvious gaps between the long sides of the two pieces of glass. If there is a gap, is it not? They all have a certain arc shape, and if so, it should be tempered. Note that it is face to face, not face back. This is physical. Otherwise, use two X-ray films that have been exposed to light. When you look at 70 degrees on the side, you should see the blue wind spot after tempering. The flatness of the glass is also significantly lower than that of the glass before tempering.
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