- It remains malleable at cryogenic temperatures
- It is soft and pliable so it fills imperfections in mating metal surfaces and creates a hermetic seal
Most materials used for sealing that work at standard operating temperatures will crack and break at the -150C cryogenic temperatures.
Often cryogenic, or any sealing, applications require that a seal be made inside a channel or other feature that isn't always flat and smooth. To illustrate how this works with indium, I used a piece of indium foil to show how it conforms to the surface of this penny.
Read more about indium metal in general or indium wire in particular.
Or, contact me directly.