Newton's metal

Newton's metal is a fusible alloy with a low melting point. Its composition by weight is 8 parts bismuth, 5 parts lead and 3 parts tin; its melting point is 97 °C.
Newton's metal is comparable to Cerrobend, but avoids its toxic cadmium content. This has encouraged its use for medical applications for easily shaped shielding during radiotherapy.

Application

Newton’s metal was used because it melts at low temperatures, making it useful for safety devices, detailed casting, electroforming cores, and heat-activated controls.