4-12mm toughened glass for doors and windows

4-12mm toughened glass for doors and windows 1. Tempered glass is produced by heating 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. 2. 4-5 times stronger than annealed glass of the same thickness. 3. Stronger resistance to thermal breakage than annealed or heat strengthened glass 4. If breakage occurs the glass breaks up into small, cubical fragments, which are not threatening to humans.