Thermal Stability of Peephole Glass

        Peephole glass is an observation port glass that is often used in high temperature places (such as boilers, reactors, electric power, and steel mills). The thermal stability of peephole glass has a significant impact on production.



        The thermal stability of peephole glass refers to its ability to withstand sudden temperature changes without damage, usually expressed in terms of temperature, which is a comprehensive performance of a series of physical properties. Rapid cooling of glass is more susceptible to damage than rapid heating. This is determined by the nature of the stress that occurs in the glass under thermal shock. Usually the glass is sufficiently resistant to compression, so the glass surface is subjected to compressive stress as the temperature rises. , which is not sensitive to temperature changes; but the situation is the opposite during rapid cooling. At this time, the surface is subjected to tensile stress, and glass is sensitive to tensile stress, and the compressive strength of glass is more than ten times greater than the tensile strength. Therefore, glass It is much stronger to be exposed to heat than to be exposed to cold. The thermal stability of the peephole glass is an important quality index.

        The expansion coefficient of the glass is of decisive significance to the thermal stability of the glass. The smaller the thermal expansion coefficient, the better the thermal stability and the greater the temperature difference that the product can withstand. . For example, the expansion coefficient of high-purity silica glass is very small (5.3-5.8*10-7/℃), so it has excellent thermal stability and can withstand temperature differences as high as about 1100℃. The thermal stability of the peephole glass can withstand 200°C, 300°C, 750°C, and 1100°C according to different materials, that is, different expansion coefficients. The high temperature quickly put into 20 ℃ water glass will not burst.

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