Tempered sight glass  are used to heat up to a certain temperature after the rapid cooling of the way, or chemical methods for special treatment of the glass. Usually on the basis of the original conventional float glass, by heating the glass to the softening point temperature and then through the quenching treatment, the glass internal base parts with tensile stress and glass surface parts with compressive stress and to achieve uniform stress balance of glass products. The types of tempered glass mirrors include chemical tungsten, also known as ionization and physical tempering.
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