Low-iron glass is a type of high-clarity glass that is made from silica with very low amounts of iron. This low level of iron removes the greenish-blue tint that can be seen especially on larger and thicker sizes of glass. Low-iron glass is used for aquariums, display cases, some windows, and other applications where clarity is desired.
Low-iron glass typically has a ferric oxide content of about 0.01%. Ordinary plate glass has about 10x 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.
Low-iron glass is sold under various brand names. Guardian Industries calls it "UltraClear" or "Ultrawhite". Pilkington calls it "Optiwhite". Vitro calls it "Starphire". Other brand names include "Starlite", "Krystal Klear", "Diamant" and "Eurowhite".
- YANG Jing-kai; AN Xue-hui; LIU Yan-li; ZHAO Hong-li (April 2009). "Analysis and Calculation of Melting Performance for the Low-iron Glass". College of Materials Science and Engineering, Yanshan University,Qinhuangdao.
- Architects, American Institute of; Hedges, Keith E. (2017-04-10). Architectural Graphic Standards. John Wiley & Sons. ISBN 9781119312512.
- "Map showing high-purity silica sand of Middle Ordovician age in the Midwestern states". United States Geological Survey. 1979.
- Patricia Lowry, Patricia (November 17, 2009). "Legacy fund to help Fallingwater windows". Pittsburgh Post-Gazette.
- "Low Iron Glass: Market Shares, Strategies, and Forecasts, Worldwide, 2015 to 2021". WinterGreen Research. Mar 5, 2015.
- "UltraWhite Low-Iron Glass". Guardian Industries. April 17, 2016.
- "Pilkington Optiwhite™". Pilkington. April 17, 2016.
- "Starphire Ultra-Clear™ glass". PPG Industries. April 17, 2016.
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