Cutting torch question

Almost pure. The only diffence between Medical grade Ox and Industrial is that the Med Ox has a control system that checks and test every so many bottles to guarantee purity.

I shore 'nuff wish I had a nickel for everyone whos had this same idea...I'd shore be rich....

A few moons ago, I looked into liquid gas seperation and it was done with refrigerating common air in effect distillation process that purifiys substances to 99.9% pure with trace elements left over.

Common air is compressed then sent thru a column distiller that refrigerates the gas to it's liquid state, it then is tapped off to that holding tank.
There's other ways of distilling common air but this is usually the cheapest for production costs.

On medical grade oxygen it's the cylinders that go under sanitation as the liquified O2 is pure enough for hunmans.

We do have another poster that says he works(ed) in a gas plant and may he can give some additional info.

Common air is about 75% nitrogen, 23% O2 and 2% trace gases and thats why it won't work for a cutting or cover gas!

T_Bone