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george is correct about the number of vacuums pulled as the only 
difference during filling.  industrial has less than medical, and 
medical has less than aviators.  that is the only difference.  
there is no magic.  the extra vacuums with low moisture oxygen is 
how they get the aviators.  its dew point must be lower to offset 
the extreme cold at altitude and the possibility of freezing.  in 
any state where you must have a prescription to get USP (medical) 
oxygen (and can't get one easily), just buy the aviators.  it is 
a little more expensive, but a much better choice than 
industrial.  industrial always runs the risk of contaminants from 
welders and others without quality check valves, manifolds, or 
regulators.   

hydrocarbon contamination is not a big problem for the oxygen 
suppliers.  we are the ones with the oil lubed compressors.  the 
safest thing is to get a booster and put your oxygen in last.  we 
have run explosion studies during hazards reviews at work.  if 
anyone doesn't believe oxygen and fuel isn't that much different 
than air and fuel is kidding themselves.  we fed oxygen and 
natural gas and ignited it and then air and natural gas and 
ignited it.  just a wee bit of difference.....like pieces of a 
process vessel as big as your garage door traveling great 
distances and going over the heads of the filmers.  underwear 
changes must have been necessary.

scott

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