Sometimes the term "fusible alloy" is used to describe alloys with a melting point below 150 °C. Fusible alloys in this sense are used for solder.
Melted fusible alloys can be used as coolants as they are stable under heating and can give much higher thermal conductivity than most other coolants; particularly with alloys made with a high thermal conductivity metal such as indium or sodium. Metals with low neutron cross-section are used for cooling nuclear reactors.
Fusible alloys are usually alloys of the relatively low melting point metals such as gallium, indium, bismuth, tin, lead, and cadmium. Sodium and potassium are also used but must be kept well away from air and water.
|Cs 77.0, K 23.0||−48|
|Ga 68.5, In 21.5, Sn 10||−19||Galinstan|
|K 78.0, Na 22.0||−11||NaK|
|Ga 62.5, In 21.5, Sn 16.0||10.7|
|Ga 69.8, In 17.6, Sn 12.5||10.8|
|Bi 40.63, Pb 22.1, In 18.1, Sn 10.65, Cd 8.2||46.5|
|Bi 32.5, In 51.0, Sn 16.5||60.5||Field's metal|
|Bi 50.0, Pb 25.0, Sn 12.5, Cd 12.5||70||Wood's metal|
|Bi 50.0, Pb 31.2, Sn 18.8||97||Newton's metal|
|Bi 50.0, Pb 28.0, Sn 22.0||109||Rose's metal|
|Sn 63.0, Pb 37.0||183||Eutectic solder|
|Sn 92.0, Zn 8.0||199||Tin foil|