lead-alkali-silicate glass

material science

Also known as: alkali-lead-silicate glass

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Last updated

June 30, 2026

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Lead-alkali-silicate glass is a type of oxide glass that includes lead oxide (PbO) and alkali oxides like potassium oxide (K₂O) and sodium oxide (Na₂O), along with silica (SiO₂). This composition results in glasses with lower softening points compared to lime glasses.1

These glasses possess higher refractive indices and electrical resistance than soda-lime-silica glasses. Historically, lead oxide was a key component in lead crystal tableware, contributing to its brilliance and sonority. Lead silicates, formed by reacting lead monoxide with silica, are used in glass, ceramics, and pigments.123

While silica glass offers excellent resistance to heat, chemicals, and electricity, lead-alkali-silicate glasses have different properties due to the inclusion of lead and alkali oxides. The specific properties of any glass are highly dependent on its chemical composition.214

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amorphous solid
Properties of oxide glasses
…a partial replacement for soda, lead-alkali-silicate glasses result that have lower softening points than lime glasses. The refractive indices, dispersive powers, and electrical resistance of these glasses are generally much greater than those of soda-lime-silica glasses.
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…a partial replacement for soda, lead-alkali-silicate glasses result that have lower softening points than lime glasses. The refractive indices, dispersive powers, and electrical resistance of these glasses are generally much greater than those of soda-lime-silica glasses.
Read More