A hermetic seal is an airtight seal. For example,
tin cans are hermetically sealed. The term is often used to describe electronic parts that are designed and intended to secure against the entry of
microorganisms and to maintain the safety and quality of their contents. Applications include
semiconductor electronics,
thermostats,
optical devices, and
switches. The food, chemical, and medical industries all have applications for the use of such "airtight" packaging, such as
induction sealing, as well. High-end
coffins, too, are often made to be "hermetically sealed" and must be of metal or of other material with metal lining, and constructed so that when closed and fastened the coffin is completely airtight. In some
nuclear reactor designs, the reactor is housed in a hermetically sealed
reactor vessel.
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Closed by fusion, gasketing, crimping, or equivalent means so that no gas or vapor can enter or escape.
(49CFR171)
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