We do freeze the tubes too but have never freeze the butane; been wanting to try that.
We've had good experience with blasting until fluid starts to come out. Then stop blasting until the fluid stops then repeat until fluid is clear. (You want to keep the can sealed on the tube to keep the suction in the tube.)
This leaves basically no "excess" butane in the collection chamber and manages the use of the butane very well.
you need to be sure and set up some side by side runs.. its well worth it to invest the extra time to see the results..
please, i dont think im crazy. try it out, throw some cans of butane in the freezer at least over night... should get plenty chilly, (put your freezer on coldest setting!)
need to be using exact same material for each test though, along with exact same packing density..
just make the runs completely identical, i would still recommend you insulate/freeze both tubes/runs, just change the butane source, (cold/room temp)
compare! give us results!
i kind of want to test again... but i already did, someone else pleaseeee.
if i dont have chilled tane, i dont blast... its worth the wait :]
i swearrrr the cold helps.. i have a hands free blasting system, so im not even sure if the rate at which it pours out is slower than room tem por not.. i just goo, and judge by sound of can.. after each can, i let it sit still pluggin hole , i spray first one, let it run out, wait about 2 minutes..
spray 2nd one, let it run out, basically wait till it gets pretty down far my tube.. wait about 4 minutes.. once i have tane exiting my tube, its pretty much a simple blast through with my last can..
if i could freeze my packed tubes, i def would.. but thats no option, i would need a huge freezer..
so i got with wrapped tubes., chilled cans..