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To: fhd@in*.ne* (Frank Deutschmann)
Subject: Re: mixing your own
From: Jason Rogers <gasdive@sy*.DI*.oz*.au*>
Cc: techdiver@opal.com
Date: Sat, 15 Apr 1995 09:06:53 +1000 (EST)

Hi,
Frank Deutschmann said;
in the shield gas before weld quality becomes an issue.)  There is no
"life support" grade of He available to my knowledge.
---

I buy "Medical Grade" He,  There is also available "Diving Grade" which
contains 2% O2.  (Because of safety, In a commercial heliox diving situation
having "pure" gas onsite is dangerous.  If it is switched to the diver by
mistake then he would die before you had time to correct the situation.
2% means that the O2 level will support life at most of the depths that
heliox is used).  There is also "Laser Grade" which is fantasticly pure.
(and fantasticly expensive)  99.999% He or better.

Cheers Jason :)

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