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Answers.comÂ® is making the world better one answer at a time. no...salt, sugar, flour...none of these expire. your epsom salt package might have an expiration date..probably indicating shelf life....generally how long it can be expected to remain on a shelf before it's effected by moisture.
Best Answer: They have an expiration date because they have chemicals in them they will lose their potency if they are not used it time, and they will dry out and become useless. It doesnt matter if they stay in the packet, not opened, ,they will still expire, same as food...lol. Source(s): amanda Â· 7 years ago.