How long does PG keep?

[Stranger]

Does PG have an expiration date?
The best source for me is going to be farm store that sells USP grade PG by the gallon.

It sets there in clear plastic jugs at room temp. just fine so I assume storage is no problem.

Any tips to keep it "fresh" ? (if there is such a thing)

 

[Misty]

The PG I got from the pharmacy have an expiry date on them - 2 yrs.

 

[Vaporer]

The 2 yr date is at ambient temperature according to Dow Chemical.
I'd say much longer if well cooled.

Vaporer

 

[Stranger]

Thank you both very much!