Extra clear glass, also known as low iron glass or ultra-clear glass, is a type of glass that has a very low iron content, resulting in a crystal-clear appearance with minimal color distortion. Compared to standard clear glass, which typically has a greenish tint due to its iron content, extra clear glass has a higher light transmittance and a clearer view.

The low iron content in extra clear glass also results in a higher level of transparency, making it a popular choice for applications where clarity and color accuracy are important. Extra clear glass is often used in high-end architectural and interior design projects, as well as in specialty applications such as aquariums, display cases, and art installations.