The main ingredient of glass is silica which has naturally occurring iron oxides. It is these oxides that cause the greenish tint you can see in most butt jointed structurally glazed windows such as total vision systems, shop fronts, showers, glass cabinets etc.
Low iron glass is made from a high-quality silica which has approximately 75% less iron content than standard float glass, allowing for a clearer glass with much higher light transmission. All other finishing processes are the same as standard float glass.
Low Iron glass is perfect for areas which require excellent clarity like shop fronts, display cases, aquariums and in decorative situations. Due to its clarity, low iron glass has poor solar control.