What details should be paid attention to when choosing tempered glass?
Tempered glass, how do we distinguish between ordinary glass and tempered glass? First of all, check whether there is a tempered 3C mark on the corners of the glass. The 3C mark (the kind that cannot be scraped off) is tempered glass. The processing procedure of tempered glass is to first cut the ordinary float glass into the required size, then grind the edge, clean it, and use ink to print the compulsory certification CCC mark. The glass, after entering the tempering furnace to burn the product, cannot be cut or processed again, and the ink cannot be scraped off after being exposed to high temperatures.
Tempered glass can explode during tempering, processing, storage, transportation, installation, and use. Tempered glass explosion can be described as the phenomenon that tempered glass automatically breaks without external direct influence. Generally, the self-explosion rate is calculated by the number of pieces, without considering the area size and thickness of a single piece of glass, so it is not accurate and cannot be compared more scientifically. The same premise is determined: every 5 to 8 tons of glass contains a nickel sulfide that is enough to cause self-explosion; the average area of each piece of tempered glass is 1.8㎡; the nickel sulfide is evenly distributed. The self-explosion rate of each manufacturer in China is not consistent, ranging from 3% to 0.3%. To uniformly calculate the self-explosion rate, it is necessary to confirm the same assumption. The calculated self-explosion rate of 6mm thick tempered glass is 0.64% to 0.54%, that is, the self-explosion rate of 6mm tempered glass is about 3‰ to 5‰. This is consistent with the practical value of domestic high-level processing enterprises.
The finished tempered glass cannot be punched again. This is because during the manufacturing process, the glass is quickly cooled, and the internal structural stress should be in a state of equilibrium. If a hole is punched, this state will be destroyed and it will break into small particles, but it can be done after annealing and then tempered. Tempered glass is first punched and then tempered. It cannot be punched after tempering. Tempered glass is processed from ordinary glass, which greatly increases the strength of ordinary glass and reduces its deformation ability, so it will break completely if it is damaged.
Rules for drilling holes in tempered glass:
1. Only tempered glass with a width greater than 8 times the thickness can be drilled.
2. For tempered glass with a thickness not exceeding 12mm, the distance from the edge of the hole to the edge of the glass should be no less than 1.5 times the thickness of the glass; for tempered glass with a thickness exceeding 12mm, the distance from the edge of the hole to the edge of the glass should be no less than 2 times the thickness of the glass.
3. The diameter of the circular hole on the tempered glass should be at least 1.6mm larger than the thickness of the glass; the diameter of the circular hole should be less than 1/3 of the width; for the special-shaped holes on the glass plate, the fillet radius of the corner should be greater than the thickness of the glass.
