Hi so like the topic says I’m on a quest to improve the vacuum level in my short path. With the current set up we typically end up pulling cannabinoids around 215C in the mantle and ~1600 micron vacuum level after the first cold trap. I would like to get down to pulling cannabinoids around 170 - 180C and 50 micron.
Current set up is a 20 L summit boiling flask with one glass cold trap --> then some of this vacuum tube(wall thickness is only 0.11") --> into a 6" steel bhogart cold trap and viton gasket --> connected to Welch CR/V Pro 16 with some red rubber vacuum tubing(not sure but wall thickness appears about 5/16").
When I hook the CR/V Pro 16 straight up to the vacuum gauge through the red rubber hose it pulls about 52 micron. As soon as I hook up the steel cold trap with the thinner walled vacuum tubing the vacuum jumps to about 512.When I hook up the whole system and dry vac it pulls about 600. Seems to me that the vacuum hose or steel cold trap is preventing our system from pulling sub 1000 micron during distillation. Is it possible that the clear tubing listed is not made for these vacuum levels? I have seen that a lot of people run with no rubber tubing and go all metal bellows, what is the advantage of this?