The significance of tempered glass hot dip treatment how to distinguish the quality of glass
The significance of tempered clear toughened glass hot dip treatment how to distinguish the quality of clear toughened glass
clear toughened glass is an item that we often touch and use in our daily life. From daily necessities such as clear toughened glass cups to architectural decoration materials such as clear toughened glass curtain walls, clear toughened glass has made great contributions to the development of world civilization. For example, we often hear about the processing accuracy of clear toughened glass, which is often used to manufacture low iron tempered glass with outstanding performance. Next, we will briefly introduce why tempered low iron tempered glass needs to be heat-dipped, and explain how to distinguish the quality of low iron tempered glass.
1. The significance of tempered low iron tempered glass hot dip treatment
Hot dip treatment is also known as homogenization treatment, commonly known as "detonation". Hot dip treatment is to heat the tempered low iron tempered glass to 290℃±10℃, and keep it for a certain period of time, so that the nickel sulfide can quickly complete the crystal phase transformation in the tempered low iron tempered glass, so that the tempered wholesale tempered glass that may burst after use is artificially broken in the factory ahead of time. in the hot-dip furnace, thereby reducing the bursting of the tempered wholesale tempered glass in use after installation. This method generally uses hot air as the heating medium, which is called "Heat Soak Test" abroad, or HST for short, which is literally translated as hot dip treatment.
Difficulty in heat soaking. In principle, hot dip treatment is neither complicated nor difficult. But in fact, it is very difficult to achieve this process index. Studies have shown that there are many specific chemical structural formulas of nickel sulfide in wholesale tempered glass, such as Ni7S6, NiS, NiS1.01, etc., not only the proportions of various components are different, but also other elements may be doped. The speed of its phase transition is highly dependent on the temperature. Studies have shown that the phase transition rate at 280°C is 100 times higher than at 250°C, so it must be ensured that each wholesale tempered glass in the furnace experiences the same temperature regime. Otherwise, on the one hand, the wholesale tempered glass with low temperature cannot be completely phase-transformed due to insufficient heat preservation time, which weakens the effect of hot dip. On the other hand, when the wholesale tempered glass temperature is too high, it will even cause the reverse phase transition of nickel sulfide, causing even greater hidden dangers. In both cases, the heat-dipping process can be ineffective or even counterproductive. The uniformity of temperature during operation of the hot dip furnace is so important, and the temperature difference in most domestic hot dip furnaces even reaches 60°C during hot dip and heat preservation, and it is not uncommon for imported furnaces to have a temperature difference of about 30°C. Therefore, although some tempered tempered shower glass has been heat-dipped, the burst rate is still high.
Second, how to distinguish the quality of tempered shower glass
In the inspection of tempered shower glass sheets, the appearance quality is mainly to check the flatness, and observe whether there are quality defects such as air bubbles, inclusions, scratches, lines and fog spots. Transparency, mechanical strength and thermal stability of tempered shower glass are not suitable for selection in engineering. Since tempered shower glass is a transparent object, the quality can be basically identified by visual inspection during selection.
In the inspection of tempered shower glass processing products, in addition to the inspection according to the requirements of Flat tempered shower glass, the processing quality should also be inspected, whether the specifications and dimensions are standard, the processing accuracy and pattern clarity meet the requirements, and the edges are not allowed to have defects.
The appearance quality of hollow tempered shower glass bricks is not allowed to have cracks, no opaque unmelted material is allowed in the clear toughened glass blank, and poor welding and bonding between the two clear toughened glass bodies are not allowed. Visual inspection of the brick body should not have ripples, bubbles and clear toughened glass blanks The layered stripes produced by the inhomogeneity in the large surface of the clear toughened glass brick should be less than 1 mm in concave and 2 mm in outer convexity. The angle should be square.
wholesale tempered glass selection:
1. Look at the fragments: You can check whether the scraps cut by the merchants are broken into small obtuse-angle particles, and then judge whether they are qualified or not.
2. Look at the stress class: under some special natural light (or polarized light) conditions, observe the reflected light of the tempered wholesale tempered glass, and you can see that there are light and dark stripes on the surface of the wholesale tempered glass, and the stripes with inconsistent brightness are called stress classes.
3. Look at the flatness: the flatness of the tempered wholesale tempered glass is slightly worse than that of the annealed wholesale tempered glass, and the flatness should be selected by comparison. Be sure to read the product manual to find out whether it has been homogenized.