A hermetic seal is simply a watertight and airtight seal. The first hermetic seal was an airtight glass tube known as the Seal of Hermes, which was used in very early alchemy.

Is hermetically sealed the same as vacuum sealed?

With vacuum packing, most air is removed from the packaging, after which it is hermetically sealed to maintain the vacuum. ... By withdrawing air, the pressure in the package is reduced.

What is a hermetically sealed package?

A hermetic seal is an air tight seal that is used to prevent contaminants such as solids, liquids, or gases from entering a package. Hermetic seals used in a wide range of applications including semiconductor electronics, thermostats, optical devices, MEMS, and switches.