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In most cases all grades of oxygen are the same. Aviator grade is 
guaranteed to be dry enough for high altitude / extreme cold. It may 
actually be too dry for comfortable breathing. However, since technical 
grades of oxygen are not checked there's a remote risk of contaminants. In 
practice a welder would hardly be able to fill anything into his tank but 
if he did it would pass unnoticed. Medical gas is certified -- that's all 
there is to it.

regards,

Hans

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