Tempered glass is a type of glass with even compressive stress on
the surface which is made by heating float glass to nearly
softening point and then cooling it down rapidly by air. During the
instant cooling process, the exterior of glass is solidified due to
rapid cooling while the interior of the glass is cooled down
relatively slowly. The process will bring the glass surface
compressive stress and the interior tensile stress which can
improve the mechanical strength of glass by germinatio...