This tempered glass is produced by heating a sheet of annealed glass in a furnace to 620°C. Progressing from the furnace, the glass is rapidly cooled with jets of cold air, inducing compressive stresses to the surface while the center remains tensile. This featured tempered glass is 4 to 5 times stronger than an annealed glass of the same thickness.
Stronger resistance to thermal breakage than annealed or heat strengthened glass.
If breakage occurs, the glass breaks up into small, cubical fragments.