Shelf life
Shelf life was the length of time a chemical could remain potent while not in use. A product whose shelf life had ended was said to be expired.

Gronerium compound 3983 had a shelf life that exceeded ten standard years without its potency diminishing appreciably. This information was available on the 's computer database. (, okudagram)

In 2377, Chellick declined Gar's offer to sell Hospital Ship 4-2 more cytogenics, claiming the last shipment consisted of expired lots and diluted samples. ()

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Chemistry