An integral rubber ring on the underside of the lid creates a hermetic seal to the jar.

The seal between the shell and insert may be moisture resistant or a hermetic seal.

These are usually thick-walled steel cylinders with a hermetic seal which must withstand high temperatures and pressures for prolonged periods of time.

This makes carbon dioxide preferable for fumigation in situations where a hermetic seal can not be maintained.

Magnetic liquid seals are used in rotating equipment to enable rotary motion while maintaining a hermetic seal by means of a physical barrier in the form of a ferrofluid.