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If you have a sealed system and are willing to use alkali metals, there are many
choices for low melting alloys, including NaK eutectic, which melts at about -12
C,
and a ternary eutectic of NaKCs that I found that melts at approximately -75 C.

Fred Tepper

Trung Duy Truong wrote:

> Hello,
>
>         I would like to post a message up for discussion. I need to find a
> liquid metal (alloy) with a low melting temperature. Or a conducting
> liquid with a very low vapor pressure so that it does not easily
> evaporate. I already know of the Indium, Gallium, and Tin eutectic (and
> also the one with zinc). But if anyone knows of a better choice of a
> conducting fluid, all tips with be greatly appreciated.
>
> Thanks
>
> Trung D. Truong
>
>