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For several years now I have used chemical heat packs inside my drysuit for
very long/cold dives. They give off a fair amount of heat for several hours
at the surface. Underwater, my impression is that the higher the pO2, the
hotter and faster they burn, which would seem logical.

Are there any chemists out there who would know if this is the case and
whether there is likely to be any problems with this?

According to the wrapping they contain Iron powder, water, vermiculite,
active carbon and table salt.

I never tried them in an Argon environment but I'm sure they won't work.


Mark Caney

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