A seal for devices such as a solid oxide fuel cells. The seal is a double seal having a first sealing material having a first preselected characteristic and a second sealing material having a second sealing characteristic. In one embodiment of the invention the first sealing material is a compressive sealing material and the second sealing material is a hermetic sealing material. In some embodiments a dimensional stabilizer may also be included as a part of the seal. In use these double seals provide superior thermal cycling stability in electrochemical devices where gasses must be separated from each other.
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY-SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made with Government support under Contract DE-AC0576RL01830 awarded by the U.S. Department of Energy. The Government has certain rights in the invention.