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Published on Apr 15, 2012
Don't use hand Warmers as Oxygen absorbers for food storage.
Hand warmers stop working in low O2 environments. and Their manufacturers admit that. They designed the boot and glove warmers to work in a lower O2 environment of about 1.5 to .5 % . They're designed to work in more enclosed environments though. The problem is that bacteria, mold and even insects can thrive in some amazingly low O2 environments. It's when you can get the O2 level down to fractions of a percent in this case you need .1 % that you're really protected from everything.
Note* Multisorb site noted a report showing that mold can start growing in a .2% oxygen environment.