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The critical parameters of silica refractories, such as compressive strength,  bulk, density, quantity of silica, microstructure and porosity were evaluated  of unused and used bricks to line the crowns of glass furnaces, when the rate  of corrosion of crowns were about 2 times greater. The change of these  parameters, the chemical composition and formation of the microcracks in the  used silica refractories material were studied. It was established that the  short time at service of container glass furnace crown can be related to low  quality of silica brick: high quantity of CaO and impurities, low quantity of  silica, low quantity of silica, transferred to tridymite and cristobalite and  formation of 5-10 μm and more than 100 μm cracks in the crown material. The  main reason of corrosion high quality silica bricks used to line the crown of  electrovacuum glass furnace is the multiple cyclic change of crown  temperature at 1405 - 1430°C range in the initial zone of crown and at 1575 -  1605°C range in the zone of highest temperatures

Silica crown refractory corrosion in glass melting furnaces