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I have also always heard that medical grade O2 is the same stuff, just handled more carefully. However, we just bought some "laser grade" gas, which was a lot more expensive and is supposed to be at least medical purity. An industrial K bottle fill (I think it's a K. Around 480 cuft @ 2500 psi, or so.) would cost $20-30, but this laser stuff is several hundred dollars a bottle. We use this gas in a continuous beam 5 kilowatt CO2 laser (Dan, you can keep that little race gun). Basically, we make a low pressure gas mix of CO2, Oxygen, and helium, and tear the gas apart into a plasma with lots of amps and volts. Impurities in the gas cause the electrodes to arc and collapse the plasma, and the laser shuts off. Anyway, the new laser gas arcs much, much less. Nice, pure stuff, and if medical grade is the same, great. This stuff might be better than medical, though. Just the same, I don't think we are talking about big impurities in the industrial stuff, if our laser is any gauge. I'd feel safe breathing it, as long I knew that they hadn't left 15% CO in it from the last fill. #----------------------------------------------------# Roger Carlson H 310-frogger Somewhere off Hermosa Beach, CA W 310-813-0858 Roger_Carlson@at*.sp*.tr*.co* F 310-812-1363 #----------------------------------------------------#
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