Well made, clamped, and temperature stabilized circular O-rings should be used in the design of
reliable, reusable and long life seals in vacuum sealing applications. Benefits:
Leak free flanges as well as low/undetectable outgassing of the elastomeric materials can be achieved at pressure levels as low as 10-8 Torr by using well made O-rings in a static vacuum seal environment. The use of O-rings has provided ease for running environmental tests on the ground using space simulation chambers.