Lowtemp or fusible alloys are those alloys that melt at temperatures below 302°F (150°C). They are traditionally made of bismuth, lead, tin, indium and cadmium in different proportions depending on the desired properties.

Lowtemp alloy are used for protection shields for radiotherapy, dies and moulds, casting tests, gauging of the bore diameter, reproductions of models, weldings at low temperature, locking mechanical devices.

Bismuth alloys 

The chief component of lowtemp alloys is bismuth, a heavy, coarse crystalline metal that expands when it solidifies. Water and antimony also expand on freezing, but bismuth expands much more than the former, namely 3.3% of its volume.

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