A hermetic seal has the quality of being airtight. In common usage, the term often implies being impervious to air or gas. When used technically, it is stated in conjunction with a specific test method and conditions of usage.
Famous quotes containing the word seal:
“We have progressively improved into a less spiritual species of tenderness—but the seal is not yet fixed though the wax is preparing for the impression.”
—George Gordon Noel Byron (1788–1824)