Curved tempered glass is glass that has been reheated and shaped, usually over a metal mold, to a desired bend or curvature, and left to cool in that position. Curved tempered glass can be found in vehicles (many windshields and some backlights are curved on the edges) as well as in architectural designs, from glass domes and handrails to revolving doors and display cases.
Tempered safety glass has a much higher thermal shock resistance than float glass. Tempered safety glass can resist a thermal shock of as much as 150K, whereas float glass can only withstand thermal shock of 40K.
Tempered safety glass is considered safety glass, however, primarily due to the way it breaks. Because it is in state of internal tension, when it breaks it shatters suddenly into small fragments with blunt edges, which considerably reduce the risk of severe injury.