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From: "John R. Rose" <rose@cs*.sc*.ed*>
Subject: Re: Helium and purity
To: aaamodt@on*.no* (Atle Aamodt)
Date: Fri, 14 Nov 1997 16:49:07 -0500 (EST)
Cc: techdiver@aquanaut.com, cavers@ge*.co*

> 
> 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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