is a Heat Processed Glass produced by heating annealed glass to
approximately 650ºC (1202ºF), at which point it begins to soften. The
surfaces of this heated glass are then cooled (quenched) rapidly.
It results the outer skin under powerful compressive stress and the
interior with secure tensile stress.
In consequence, the impact applied to the glass will be overcome by
the compressional force as the surfaces to assure safety if use.