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Indium is often used to form air-tight seals between glass components because it is soft enough to mold itself to the shape of the glass, and because unlike rubber or other organic seal materials it is really 100% gas-tight and it doesn't release volatile compounds of its own. For high-vacuum applications only glass and metal can come in contact with the vacuum because anything else would either out-gas or leak.
Source: Ethan Currens
Contributor: Ethan Currens
Acquired: 14 June, 2008
Text Updated: 14 June, 2008