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'Field's metal', or 'Field's alloy', is a fusible alloy that becomes liquid at approximately 62 °C (144 °F). It is a eutectic alloy of bismuth, indium, and tin, with the following percentages by weight: 32.5% Bi, 51% In, 16.5% Sn.
As it contains no lead nor cadmium, it is a non-toxic alternative to Wood's metal.
It is used for die casting and easy prototyping.