STELLA GNL -a new silica grade- is characterized by a SiO_2 content of 99 wt.% and has no lime in the bonding phase. In contrast to this, the standard silica grades exhibit a SiO_2 content between 95 and 97 wt.% and a lime content of approx. 2.5 wt.%. Based on the improved chemical composition, the new Silica grade has a higher corrosion resistance against alkalis and is a suitable grade for the crown of oxy-fuel fired soda-lime furnaces. For conventional firing (air-fuel), this new grade can be used at higher temperatures than standard silica grades.
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