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What percentage of silica is typically found in soda-lime glass?

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Soda-lime glass typically contains approximately 70 to 75 percent silica (silicon dioxide) by weight.12

The exact percentage can vary depending on the specific application of the glass. For example, representative compositions for common soda-lime silicate products include:3

Window glass: 72.0 percent silica
Bulb and tube glass: 73.3 percent silica
Container glass: 74.0 percent silica
Tableware: 74.0 percent silica

Silica serves as the primary structural component of the glass, while other ingredients like soda (sodium oxide) and lime (calcium oxide) are added to lower the melting point and improve chemical durability, respectively.123