Difference between revisions of "Lead glass"
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== Description == | == Description == | ||
| − | Glass containing [http://cameo.mfa.org/materials/fullrecord.asp?name=lead | + | Glass containing [http://cameo.mfa.org/materials/fullrecord.asp?name=lead%20tetroxide lead oxide] as one of its ingredients. Lead oxide acts as both a flux and a stabilizer typically replacing some of the calcium in a [http://cameo.mfa.org/materials/fullrecord.asp?name=potash%20glass potash glass]. Lead glass contains about 18–35 mol% PbO, compared to modern [http://cameo.mfa.org/materials/fullrecord.asp?name=crystal%20glass lead crystal] that contains a minimum of 24% lead oxide. The addition of lead oxide to glass increases the [http://cameo.mfa.org/materials/fullrecord.asp?name=refractive%20index refractive index] (from about 1.5 to 1.7) giving the glass its optical brilliance. The earliest known example of lead glass is a blue glass fragment from Nippur dated to 1400 BC containing 3.66% PbO. |
| − | See also [http://cameo.mfa.org/materials/fullrecord.asp?name=potash-lead | + | See also [http://cameo.mfa.org/materials/fullrecord.asp?name=potash-lead%20glass potash-lead glass] and [http://cameo.mfa.org/materials/fullrecord.asp?name=leaded%20glass leaded glass]. |
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
Revision as of 06:49, 24 July 2013
Description
Glass containing lead oxide as one of its ingredients. Lead oxide acts as both a flux and a stabilizer typically replacing some of the calcium in a potash glass. Lead glass contains about 18–35 mol% PbO, compared to modern lead crystal that contains a minimum of 24% lead oxide. The addition of lead oxide to glass increases the refractive index (from about 1.5 to 1.7) giving the glass its optical brilliance. The earliest known example of lead glass is a blue glass fragment from Nippur dated to 1400 BC containing 3.66% PbO.
See also potash-lead glass and leaded glass.
Synonyms and Related Terms
litharge glass; verre au plomb (Fr.); vetro al piombo (It.); loodglas (Ned.); vidro de chumbo (Port.)