Can i run passive with a 70/30 blend?

Rainbowp3nis · June 28, 2020, 8:50pm

70%iso 30% propane

Curious_Roberto · June 28, 2020, 9:11pm

70 butane/30 propane I assume?

Dry ice slurry and coils and you should be fine.

@cyclopath has posted a graph a few times that shows the boiling points of various solvent mixtures.

Curious_Roberto · June 28, 2020, 9:15pm

70/30 needs to be at minimum of -10 to be at 0psi vapor pressure according to that graph.

Hansel · June 28, 2020, 9:17pm

Yeah, you can. I have ran passive with 95propane/5iso.

Curious_Roberto · June 28, 2020, 9:18pm

I ran whipit which was a tri blend just fine too.

Hansel · June 28, 2020, 9:20pm

Nice. I distilled some whip it right when I got my cls set up. That’s all I used when I had a closed column and I didnt want the last few cases of cans I had to go to waste.

I have also used the bvv tri blend With good results.

Curious_Roberto · June 28, 2020, 9:24pm

I’ve been wanting to try straight iso, but I’m so small time I can’t justify buying a full 22lb tank though.

I didn’t like messing with tri blends and getting the ratios changed over time.

Rainbowp3nis · June 28, 2020, 9:25pm

im assuming i may or may not have to run nitro?

Hansel · June 28, 2020, 9:27pm

If you were running straight n tane previously, then switching to iso/propane would increase your systems psi (due to its boiling point being lower), on my passive system, that psi change wouldn’t be enough to allow me to run without n2, especially through CRC