I dontt know if you are aware of this, but the mapp/pro gas in the yellow cylinder isn't actually pure propylene. A mixture of propyne 30%, propadiene 14%, propylene 43%, propane 7%, C4H10 (isobutane, butane) 6% might be more typical. The manufacturers decided to stick some other stuff in the can because the mixture boils off better at lower temperatures.
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