In the US, the *only* difference between welding, medical and aviator grade
02 is the container, and the tracking thereof. Aviators and USP 02 are never
let out to welding shops. Also, the moisture content of each bottle of
aviator grade is tested and logged for moisture. I know *lots* of people who
have been diving and blending with welding 02 for years. All 02 is decanted
from the same bulk container and truck.

Scott

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