I find that interesting. I have been using propylene, or propane now for about five years, and keep an owned bottle of acetylene on hand for the odd occassion when I need it. I have the big Victor regulators. Probably 98% of the time the regulator is running propane, 2% of the time back on acetylene. After five years of this I can see NO problems with pressure adjustment when using acetylene. Seems like it would have to be one heck of a film to cut down on the pressure. As I said it is interesting and something that I will keep an eye on.
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