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The chemical composition of the glass is very stable. In its natural state, the glass will not be affected by sunlight, rain and fog, and its performance will not be reduced. Ordinary acids and alkalis will not damage the glass. This is clear when we think about the chemical test utensils when reading Too. Usually there are only two conditions that affect the life of the glass, humid air and high temperature.

Continued humid air can cause mildew on the glass, but the mildew on the glass is very slow at normal temperature. It usually takes a few months. Under normal use, there is very little humid air for a few months. Therefore, the glass will not be moldy when exposed in the air. Generally, mildew of glass occurs during the stacking and storage of glass. It is relatively easy for glass to pile up and rain in a wet warehouse or in the open air. Generally speaking, the original glass without tempering is easier to mold than the glass through tempering.

Irrespective of the elements of thermal cracking, temperatures below 300 ° C have no effect on the glass life and chemical stability. However, as the temperature increases above 300 ℃, the physical and chemical properties of the glass will change with the increase of temperature. In terms of physical properties, general glass begins to soften around 600 degrees. From a chemical point of view, the increase in temperature will cause crystallization within the glass, and the glass will gradually change from transparent to ambiguous. At 700 ℃, the process of devitrification of the glass will take several days, and at 300 ℃, it may take months or even years.

At room temperature, the crystallization of glass may become ambiguous. It may take tens of thousands of years, so it can be ignored. Life of tempered glass Physical toughening is to heat the glass and then quench it, and the structure of the molecules inside the glass is changed; chemical tempering is used to ion exchange the molecular structure of the glass surface at high temperature; both methods are long-lasting Changed the microstructure of the glass material. Therefore, unless there is high temperature and strong chemical action, the characteristics of tempering will not decay or change with the change of time under normal use.