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Jason,

When I said "balloon grade" what I actually meant was welding helium
which does NOT have O2 in it. In my small part of the world, all of the
balloon helium that I've seen has been welding helium.

This brings up an interesting point. I vaguely remember a post from
a few years back the possiblity of croaking by breathing a couple of
pure helium breathes of pure helium. Something to the effect that having
no O2 at all even for a short time was fatal. It was probably on
techdiver, this seems to be where a lot of these interesting urban
legends start. This was at about the same time that the theory of getting
torqued from using argon inflation was circulating. Do you remember any
of this?

-John

 
> Don't use Balloon Grade unless you get spec's from the vendor as to it's
> content.  Some balloon grades have O2 in it to prevent kids from croaking if
> breathed.  It would be more like Heliox.  Mixing this in would be like using
> your ass for ear muffs.-----Jason
> 
> John R. Rose wrote:
> 
> > >
> > > Anyone.
> > >
> > > >From a practical point of view, how pure must  helium used in trimix
> > > actually be ?.
> > > I guess this depends upon the He ppO2 during the exposure ? Can anyone
> > > enlight me on this one ?
> > >
> > > Regards
> > >
> > > Atle Aamodt
> > >
> > >
> >
> > "From a practical point of view", balloon grade helium is the only type
> > that is affordable. Aside from the fact that the ultrapure helium
> > that is used in labs is serious overkill in terms of purity it is also
> > much too expensive.
> >
> > -John
> 
> 
> 
> 

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