Contact: Daniel Stolte
University of Arizona
Caption: Casting of a 4 meter mirror substrate made of "Zerodur" glass ceramic on June 2, 2006 at SCHOTT headquarters in Mainz, Germany. The molten glass is heated to more than 2,732 degrees Fahrenheit (1,500 degrees Celsius). After cooling and preliminary processing, the substrate is ceramized in an 11-month process in which the glass is transformed to glass ceramic.
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