As Nick commented, things vary depending on the supplier. As best as I can tell the situation in Sydney with CIG supplied O2 is that the only difference between medical and industrial grade O2 is in the handling of the cylinders. Here, I believe, medical grade O2 cylinders are recleaned before each reuse, and this is not the case with industrial O2 cylinders. Greg Ryan gregr@cs*.su*.oz*.au*
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