Splav Vuda, Dnipropetrovsk region.

"
Wood alloy (pellet)
Melting point 60-68.5 °C, density 9720 kg/m³.
When working with thin parts, for example, during the repair of mobile phones and other microcircuits, high strength is not required, but a melting temperature as low as possible is required. Solder alloy Vuda was created just for such purposes(//tractor-service.com)
The uniqueness of this material is its ego composition. Here, it is necessary not only the exact presence of certain elements, but also the ratio of their content. The exact and most effective composition of Wood's alloy looks like this:
Tin — 12.5%; Lead — 25%; Bismuth — 50%; Cadmium — 12.5%.
Wood's alloy is used in precision casting, in bending operations of thin-walled pipes, as molten rods in the manufacture of hollow bodies by electroplating, for pouring metallographic sections, in sensors of fire alarm systems, as a low-temperature heating bath in chemical laboratories, etc.

"