Mmmmm...do you have old/new stuff? Video camera? Maybe an experiment is in order. :cool:
I'm sure I have some expired packs of fairy dust lying around if you need a contribution to the effort. :D
All my new stuff is non exothermic.
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Mike G you have a PM.
.....
Out of curiosity I dug out my old powder to see what the expiration dates were. I had bought it about 4 years ago so I was surprised it was still good.
Surprise it had been relabeled to extend expiration.
Lot 1659 original expiration 2009-12.
Lot 1659 relabeled extension to 2011-09.
is this the same stuff that REI is selling?
http://www.rei.com/product/770187
Same agent just in a tea bag rather than a gauze form.
IIRC they put the granules in the bag so it's easier for the next echelon of care to remove from the wound without the excessive disturbance that washing out straight granules cause.