Galinstan is a brand name for an alloy composed of gallium, indium, and tin which melts at −19 °C (−2 °F) and is thus liquid at room temperature.

[15] In August 2020, Sony Interactive Entertainment patented a galinstan-based thermal interface solution suitable for mass production,[16] for use on the PlayStation 5.

Galinstan is difficult to use for cooling fission-based nuclear reactors, because indium has a high absorption cross section for thermal neutrons, efficiently absorbing them and inhibiting the fission reaction.

[17] The wetting characteristics of galinstan can be utilized to fabricate conductive patterns, allowing it to be used as a liquid, deformable conductor in soft robotics and stretchable electronics.

Galinstan can be used to replace wires, interconnects, and electrodes as well as the conductive element in inductor coils and dielectric composites for soft capacitors.