In the 1990s, a silica brick retrieved from a conventional air-fired float glass furnace was analyzed to determine its alteration in service. Changes in its crystallinity, thermal expansion, chemistry, bulk density, porosity and physical appearance w ere determined at 6 different locations, going from its hot face to its cold face. Testing results and physical observations showed it to be completely altered from its original state, Considerably differences were also noted between the six different locations, going from its hot face towards its cold face. Such extensive alterations are attributed to its reaction with the alkali present in the furnace atmosphere and also the temperature and thermal gradient in which it operated.
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