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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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