[China Glass Net] Glass is an indispensable part of doors and windows. The early building windows and doors are single-layer flat glass, which has been developed into tempered glass, insulating glass, laminated glass and bullet-proof glass. Most of today's door and window products use tempered glass.
First, how to distinguish between tempered glass and ordinary glass?
1, look at the glass sign
Look at the corners of the glass for the tempered 3C mark, and the 3c mark (the one that can't be scraped) is basically tempered glass. The processing procedure of tempered glass is to cut the ordinary float glass into the required size, then edging, cleaning, and using the ink to mark the national compulsory certification CCC mark. After the tempering furnace is finished, the glass cannot be cut or processing. The ink is generally not scraped after passing through the high temperature. (If the 3C mark on your glass can be wiped off by hand, it can be basically determined to be fake tempered glass.)
2, see if it is slightly deformed
See if the glass is slightly deformed from the side, because the glass will be slightly deformed after being fired at a high temperature. This can only be seen from the side of the glass, and the front is generally difficult to see.
3, look at the fragments of glass
After the ordinary glass is broken, it is large and has sharp corners, which is easy to injure people. After the tempered glass is broken, it is granular, and the corners are very blunt, which is not easy to injure people.
Second, tempered glass is divided into shapes: flat tempered glass and curved tempered glass
Generally, the thickness of the flat tempered glass is more than four, five, six, six, eight, ten, twelve, fifteen, and nineteenth; the thickness of the more commonly used curved tempered glass is five, six, eight, and ten.
Third, tempered glass by process: physical tempering and chemical tempering
The physical tempered glass is processed by ordinary quenching method or air-cooling quenching method under ordinary process conditions under ordinary process glass or float glass. Chemically tempered glass is obtained by processing ordinary flat glass or float glass by ion exchange method, changing the surface molecules of the glass, and forming a laminated stress layer on the surface of the glass.
Fourth, the characteristics of tempered glass:
1. High impact strength
It is 4 to 5 times higher than ordinary glass; it has high flexural strength, 5 times higher than ordinary flat glass; it has good thermal stability and can withstand temperature difference of 200 °C; it is also characterized by smoothness, transparency and non-cutting. In the case of super-strong impact damage, the fragments are scattered and fine particles, without sharp edges and corners, so it is also called safety glass.
2. The thickness will be slightly thinned after tempering
The reason for the thinning is that after the glass is melted by hot melt, it is cooled rapidly by strong wind force, so that the internal crystal gap of the glass becomes smaller and the pressure becomes larger, so the glass is thinner after tempering than before tempering. In general, 4-6mm glass is thinned by 0.2-0.8mm after tempering, and 8-19mm glass is thinned by 0.9-1.8mm after tempering. The degree of specificity depends on the equipment.
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