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    Lead glass - Wikipedia

    • Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. Lead glass is often desirable for a vari… See more

    Properties

    The addition of lead oxide to glass raises its refractive index and lowers its working temperature and viscosity. … See more

    History

    Lead may be introduced into glass either as an ingredient of the primary melt or added to preformed leadless glass or frit. The lead oxide used in lead glass could be obtained from a variety of sources. In Europe, galena, lead sulfid… See more

    Lead glazes

    The fluxing and refractive properties valued for lead glass also make it attractive as a pottery or ceramic glaze. Lead glazes first appear in first century BC to first century AD Roman wares, and occur nearly simultaneo… See more

    Lead crystal

    Lead oxide added to the molten glass gives lead crystal a much higher index of refraction than normal glass, and consequently much greater "sparkle" by increasing specular reflection and the range of angles of … See more

    Safety

    Several studies have demonstrated that serving food or drink in glassware containing lead oxide can cause lead to leach into the contents, even when the glassware has not been used for storage. Due to an i… See more

    Sources

    • Deeg, Emil (1958). "Zusammenhang zwischen Feinbau und mechanisch akustischen Eigenschaften einfacher Silikatgläser" [Relationship between Fine Structure and Mechanical-Acoustical Properties … See more

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