Heat-resistant glass refers to a glass containing a strong heat-resistant boric acid or a silicic acid component and capable of withstanding a sudden temperature difference. The coefficient of thermal expansion (the ratio of expansion of the glass body due to an increase in temperature) is relatively small, and it is not easily broken under a sudden temperature change. It has a series of excellent properties such as low expansion, thermal shock resistance, high temperature resistance, corrosion resistance and high strength. The raw material price is higher than that of ordinary glass, and the manufacturing cost is also high. Therefore, the sales price of heat-resistant glass is higher than that of ordinary glass and tempered glass. The heat-resistant glass material has a high safety factor, and there will never be a self-explosion phenomenon similar to tempered glass; the coefficient of thermal expansion is small, the range of resistance to sudden temperature changes is large (≥120 ° C), and the heat resistance is up to 400 ° C. Heat-resistant glass is mostly used for utensils, milk bottles, experimental beakers, and the like.
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