Toughened glass is employed in all kinds of transport ranging from cars to ships and boats. In most countries and in almost all cases there are conventions in place pertaining to the properties of tampered glass such as thickness, strength and light transmission .Toughened glass also finds its application in building and construction industry internally and externally. It might be used in office partitions and frameless shower screens internally while externally it can be used for large window spans etc.  Paul Johnson