TOUGHENED GLASS

Toughened glass has two advantages over regular glass — when it breaks, and when it doesn’t. Because toughened glass is created with uneven heating that causes the cooling glass to form layers instead of a solid sheet, it is much more resistant to impact than “annealed” glass. It isn’t indestructible, but when it does give way, this glass comes apart in a spray of cube-like pellets rather than jagged shards.