Cryogenic seals provide a mechanical containment mechanism for materials held at cryogenic
temperatures, such as cryogenic fluids. Various techniques, including soldering and welding are available for creating seals, however specialized materials and processes are necessary to hermetically entrap cryogenic constituents under vacuum-tight conditions. Most commonly used are liquid helium and liquid nitrogen, which boil at very low temperatures, below -153 °C (120 K), as well as hydrocarbons with low freezing points and refrigerating mixtures. – information from Wikipedia.com.
The demand for seals for use in cryogenics applications is increasing, and there are certain facts about them that all engineers should now. Here are six things you should know about cryogenic seals…