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Of the many silica-based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda-lime glass, composed of approximately 75% silicon dioxide (SiO 2), sodium oxide (Na 2 O) from sodium carbonate (Na 2 CO 3), calcium oxide, also called lime (CaO), and several minor additives.
Use of float glass at Crystal Palace railway station, London. Float glass is a sheet of glass made by floating molten glass on a bed of molten metal, typically tin, although lead and various low melting point alloys were used in the past.This method gives the sheet uniform thickness and very flat surfaces.in is suitable for the float glass process because it has a high specific gravity, is cohesive, and is immiscible with molten glass. Tin, however, oxidises in a natural atmosphere to form tin dioxide (SnO 2). Known in the production process as dross, the tin dioxide adheres to the glass.