In making sheet glass it is customary to use 6 percent of lime and 4 percent of magnesia (magnesium oxide, or MgO), and in bottle glass about 2 percent alumina (aluminum oxide, or Al2O3) is often present.
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The composition, properties, and industrial production of glass are covered in industrial glass. The physical and atomic characteristics of glass are treated in amorphous solid.
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Commercial glasses may be divided into soda–lime–silica glasses and special glasses, most of the tonnage produced being of the former class.
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