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In your message dated Saturday 21, October 1995 you wrote :
> 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
>
Mark,
Rich Tuly got a fair old burn from one of these when a decent oxygen
content Eanx was used for suit inflation. As far as using them in an argon
filled suit - the lack of oxygen 'kills' the reaction. The best method we have
found to date was one of the battery powered suit heaters from Repetative Diver
- not sure if they are still in business - maybe somebody on the list can shed
a
little light on that one
Chris
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Chris Hellas
EMail:- chris@de*.de*.co*.uk*, 100422,2334@co*.co*
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