The American Society for Testing and Materials (ASTM) developed specifications for glass used horizontally for tables and desks. Annealed glass, sometimes referred to as non-tempered or common glass, typically breaks into large, sharp and jagged pieces which can cause severe injury and even lead to death. The ASTM standard requires that tempered glass, rather than annealed glass, be used in the construction of furniture. This minimizes the risk of injury in the event that the furniture glass is broken. More information regarding the standard can be found on ASTM International’s website.