Low iron glass
The color of uncoated glass depends on composition of raw materials used for its production. The standard float glass has more or less distinct slightly greenish tint, caused by presence of iron oxide in silica sand, which is the main component for glass production. The production of low iron glass requires extra efforts to improve the quality of silica sand by reducing the amount of impurities which color glass, especially iron. As a result, low iron glass comes at a higher cost, but it has very clear, colorless look, which makes it especially suitable for thick laminated glass compositions and in other cases where especially high light transmission or color rendering (Ra index) is required.