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For years I have been told by oxygen suppliers that all three grades of O2
you listed -industrial, medical and aviators- are decanted from the same
oxygen source, and are therefore, the same oxygen. The moisture
differences are generated downstream after decanting. Rod

On Thu, 14 Nov 1996, EE Atikkan wrote:

> Steve,
>   Aviation Grade oxygen is not regulated, that is why you don't need a
> prescription. Aviation O2 has less moisture in it than Medical O2, yet
> they all come out of the same vat as welding O2. The best thing to do
> is find a supplier that handles the tanks the best. Find a gas
> supplier that vacumes the cylinders before filling.
> 
> Barry
> 
> 
> Outside of the fact that getting medical or any grade O2 for resq being 
> no problem (even Rescue Squads in areas where diving is relatively 
> common will fill your tanks) why the emphasis on vacuuming the tanks.
> 
> There exists three grades of O2 on the market - industrial (welding), 
> medical (USP) & aviators.  All predicated on moisture levels in the O2. 
> Thus industrial grade O2 is fine to breathe.
> 
> AGain the question of vacuuming (a requirement 4 USP).
> 
> If a tank has 'breathable' O2 in it, why bother w/ vacuumimg it to 
> replenish it with 'breathable' O2 with x moisture.
> 
> We tend to overlook that we breathe, continuously, air that has an 
> unknown level of contaminants.
> 
> Regards
> 
> Esat Atikkan
> --
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