Traditional glass typically has a ferric oxide content of close to 0.1%. This oxide is one of three key iron oxides of iron. Manufacturers have managed to get ferric oxide levels down to just 0.01% in low-iron glass.

Is window glass low iron?

Ordinary plate glass has about 10 times as much iron content. Low-iron glass is made from low-iron silica sand. In the United States, the primary sources for such sand are in Wisconsin. Fallingwater, a house designed by Frank Lloyd Wright and built in 1939, was one of the first houses to use low-iron glass for windows.

What is clear glass made of?

To make clear glass, need the right set of raw materials is required. This consists of silica sand (SiO2), sodium oxide (Na2O) from soda ash, calcium oxide (CaO) from limestone/dolomite, dolomite (MgO), and feldspar (Al2O3).