Late to the party…
didn’t get the invite 
Not a lot left to say…thanks to @eyeworm, @TheGratefulPhil & @Concentrated_humbold.
Would I use those for hydrocarbon extraction? Nope!
Would I try and figure out some other way to use them? Quite probably…
One that stayed fairly close to ambient temps, and below 15psi. The only thing that comes to mind was stolen from @chempistry upthread…and if one could afford to pack those things with C18, then chances are one could afford more appropriate chromatography columns.
If we were moving milk around in a dairy, then the risks involved would seem pretty minimal, but given the intended use (thermal cycling, under pressure, while full of flammable gas), the risk doesn’t seem worth the cost savings.
@Rainbowp3nis, glad you’ve decided not to put the cannabis in these particular tubes.
Perhaps they could be used for stripping terpenes under vacuum?!?
bonus points if you get the “heat” by painting them black and racking them up (horizontally!) in the sunshine…