The surface of glass products currently on the market is similar, but the materials are very different.
1) No self-detonation
Unlike tempered glass, heat-resistant glass does not explode without external shock. The reasons for the self-explosion of tempered glass are as follows.
1 contains nickel sulfide (NiS)
Generally, impurities such as nickel sulfide (NiS) are mixed in the glass making process. In the manufacturing process of glass, in order to remove air, fuel or air bubbles, detergent is usually added, and sulfur (S) is present in the detergent, and nickel (Ni) is usually present in the glass raw material or in the manufacture. In the metal machine used in the process. When the two meet, nickel sulfide is formed. This is the magazine inside the glass.
The nickel sulphide present in the tempered glass is in an unstable state and there is a possibility of occurrence of a problem. The tempered glass must be subjected to quenching and tempering during the production process, and the tempering treatment causes the nickel sulfide to be in an unstable state. In contrast, ordinary glass or heat-resistant glass contains nickel sulfide, but it can maintain a stable state.
Nickel sulfide impurities are rare and cannot be found at all. However, after the tempered glass containing the nickel sulphide magazine goes on the market, it will slowly expand due to changes in the surrounding environment and temperature. This phenomenon will break the balance between many stresses existing inside the glass, and the surface of the glass may crack, resulting in self-exposure.
2 uneven treatment of tempering
Tempered glass was originally used primarily in industry, but it is currently used in household utensils. Industrial tempered sheet glass has a fixed size and shape and can be uniformly tempered. The tempered glassware cannot be uniformly tempered due to the more complicated structure. The incomplete part of the tempering treatment cannot guarantee heat resistance. Therefore, when the tempered glass is generally transferred from a high temperature to a low temperature, the portion having insufficient heat resistance may explode because it cannot withstand a sharp temperature difference. Through the interference fringe measurement experiment, the phenomenon that the tempering treatment is not uniform can be found. In general, the more pronounced the interference fringes of tempered glass, the more dispersed the various colors, indicating that the tempering treatment is less uniform.
Because tempered glassware has a more complicated structure than flat glass and cannot be uniformly tempered, the overall stress of tempered glass is not uniform. Heat resistant glass is produced by a slow cooling process and there is no stress on the glass. Tempered glass is resistant to thermal shock by stress, so if the glass stress is not uniform, it will easily break if there is a little crack, collision or sudden temperature change.
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