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It's well-known in laboratory practice that one shouldn't melt lithium in a glass equipment and there isn't such rule about other alkali metals. You may damage the glass with sodium but lithium will make a hole in your flask.

So, why does this rule only hold for lithium?

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    $\begingroup$ ... I definitely recall that one of methods of preaparation of buthyllithium includes melting of lithium in boiling dodecan. I even participated in making of one bunch using this method. Worked like a charm with no problems. $\endgroup$ – permeakra Sep 7 '15 at 9:21

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