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Heat Pack Duds?

301 Views 2 Replies 2 Participants Last post by  chaznsc
I ordered some 60-hour heat packs for shipping. I have opened 2 of them and they are both DUDS. Shouldnt they warm right up? The package says to just expose them to air.

Any advice?

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I have seen some take 5 mins and others take a good hour or so. Is there a date on them?
thanks conduct, i will look.....i probably just need to be patient.
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