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Why are lead-alkali-silicate glasses useful for low-temperature sealing glasses?
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Examining a superhydrophobic glass surface that resists fog and glare and is self-cleaning.
Lead-alkali-silicate glasses are highly valued for low-temperature sealing applications primarily because they possess lower softening points compared to standard lime glasses.1
In the chemical composition of these glasses, lead oxide replaces lime, while potash is used as a partial replacement for soda. This specific formulation results in a material that softens at lower temperatures, which is a critical requirement when creating seals between glass and other materials, such as metals. By allowing the glass to deform and bond at lower temperatures, these compositions help manage the thermal stresses that occur during the sealing process.12