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Of the many silica-based glasses that exist, ordinary glazing and container glass is formed from a specific type called soda-lime glass, composed of approximately 75% silicon dioxide (SiO 2), sodium oxide (Na 2 O) from sodium carbonate (Na 2 CO 3), calcium oxide, also called lime (CaO), and several minor additives.
Glass is a fused mixture of the silicates of alkalies, alkaline earths, and of more common. metals. Usually the alkaline bases are sodium and potassium; the alkaline earth is calcium, and the common metallic element is lead. All of these are used'in the form of salts.