The term "float" refers both to a type of glass and to the process by which it is made.
Float glass is the basic glass from which almost all the flat glass products are derived. It may be clear or coloured, and is produced in large sheets (6 x 3.21 m) that are normally processed into secondary products.
The float process involves literally floating the molten glass on a bath of liquid tin, producing a perfectly flat surface on both sides.
The raw materials for float glass are 73% sand (silicon dioxide), 15% soda (sodium carbonate), 10% limestone (calcium carbonate) and 2% various additives.