You searched for: “hermetic seals”
hermetic seal (s) (noun), hermetic seals (pl)
A device that is used to close something so it can not be penetrated by air or fluids: The engineer put a hermetic seal on the container so no air could get into it.
This entry is located in the following units: herm-, herme- (page 2) typo-, typ-, -type (page 2)