BellowsTech metal bellows are a trusted, reliable solution for NASA cryogenic temperature chambers. Maintaining temperatures as low as -95°C requires more design and expertise than making sure your favorite beverages are served at the right temperature in the refrigerator.
A rectangular bellows assembly was chosen as the mechanical seal between the door and the refrigeration unit. The metal bellows seal provides a leak-tight seal once the door is closed to prevent temperature changes. By utilizing metal, the mechanical seal ensures survival through the cryogenic temperatures of the chamber; certain materials like rubber become brittle at extremely cold temperatures. Because edge welded bellows technology is extremely light-weight in comparison to other hermetic seal technologies, the bellows is able to keep the overall weight of the system to a minimum. The thin metal convolutions of the bellows do not transfer as much heat as conventional machined parts because of their overall lower mass.