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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. Float glass is the base glass used in all subsequent glass processing options. Reducing the iron content allows for more clarity in the glass.
Low-iron glass is a virtually colorless float glass designed for high-end applications. The lower iron content of this float glass product provides high visible light transmittance and greater clarity. All low-iron glass has a subtle edge color, but is significantly lighter that traditional float glass.