[China Glass Net] Glass is an important part of doors and windows. Previously, building doors and windows used single-layer flat glass. Nowadays, tempered glass and insulating glass are used in many occasions. In general household doors and windows, tempered glass has become quite popular. But how much do you know about tempered glass?
In appearance, the glass before and after tempering does not change much. How do you tell if the glass is tempered? The easiest and most straightforward way is to see if there is a tempered 3C mark on the corner of the glass. The 3c mark 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 make the national compulsory certification ccc mark. After the tempering furnace is finished, the glass cannot be cut or processing. The ink can't be 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)
There is also a way to distinguish whether the glass is slightly deformed from the side, because the glass will be slightly deformed after being fired at a high temperature, which can only be seen from the side of the glass, and the front is generally difficult to see. .
It is also possible to discriminate whether the glass is tempered by the broken glass. After the tempered glass is broken, it is large and has sharp corners, and the tempered glass is broken after being granulated, and the corners are blunt and difficult. Injury.
The raw materials of tempered glass are required to be processed from superior or first grade float glass. There are two kinds of processes for producing tempered glass: one is to process the float glass under specific process conditions by quenching or air-cooling quenching. The other method is processed by an ion exchange method in which the surface molecules of the glass are changed to form a laminated stress layer on the surface of the glass.
Tempered glass is divided into flat tempered glass and curved tempered glass according to its shape. 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.
The tempered glass has a slight thickness thinning after tempering. The reason for the thinning is that after the glass is melted by hot melt, it is rapidly cooled by a strong wind force, so that the internal crystal gap of the glass becomes small and the pressure becomes large, so the glass is thinner after tempering than before tempering. Under normal circumstances, 4-6MM glass is thinned 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, which is why tempered glass cannot be mirrored.
Characteristics of tempered glass: high impact strength, 4 to 5 times higher than ordinary glass; high bending strength, 5 times higher than ordinary flat glass; good thermal stability, can withstand temperature difference of 200 °C; and smooth and transparent , can not be cut and so on. 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.
Therefore, even if it is more expensive, it is better to use tempered glass from the aspects of safety and thermal insulation performance.
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