I guess my last post has too many questions, so I will try it another way. I found this basic SOP on Reddit
I was wondering what criticisms people have of the technique? Anything missing here? And does anything really changes for ethanol extracts?
Reposted Steps from CaliNuggLove - edited by the Future4200 community.
NOTE: Oven tempertures over 100 f may achieve a sugared or buttered up consistency throughout part, if not all of the slab. For a clear shatter, try to avoid the nucleation/buttering once the oil is in the oven & under vacuum.
1) Preheat vacuum oven under vac to 91 f.
This is a good starting point. Generally have to take it up to 95-97 just to break the viscosity of the slab, depending on strain. Some batches/strains took over 100 f to break the viscosity, generally stay under 100 f.
2) Once the oil/slab is up to temp & viscous enough to start the vacuum process, vac. down to -20 hg slowly without forming a muffin in the oven.
Depending on the strain & viscosity, vacuum down the oven chamber so that the slab is visibly off-gassing, as well as flattening/spreading out. Avoid releasing the vac, vacuuming down, releasing vac, etc. can be detrimental & cause un-necessary agitation of the oil. This also introduces atmosphere into the oven & slabs more times than needed, & will ultimately fight against the oven’s heating mechanism.
3) Reach a full 29.92 hg in the oven chamber.
4) Re-adjust the temperature to anywhere between the starting point of 91f - 93f.
Even if the slab seems to have a high viscosity at this point, set the temperature lower as a base starting range. Keep the oven temperature set on the lower range for 24 complete hours. During that 24 hour time frame, do NOT touch, un-vacuum, or flip the slabs. Just leave them for a 24 full hours at the initial temp & full vac.
After the initial 24 hour period, open the vacuum oven chamber, clean up the edges of the slab by folding, & flip the slab completely over onto a fresh piece of parchment/PTFE sheeting. Place the slab back in the oven & gently vac at baseline temperature. Slowing ramp up temperature depending on strain. We want to see off-gassing.
Opinon 1) Flip slabs every 24 hours, sometimes more, sometimes not as much. It really depends on each specific batch. Do try to flip a minimum of at least 4 times throughout the entire purge process of 4-5 days [72-96 hrs.].
Opinion 2) If you still have a few bubbles left in the slab after purging for a few days, they are more than likely either trapped atmosphere from flipping the slab (probably not), or terpenes boiling off (which you don’t want). A lot of times, just pulling the slab & letting it sit at atmospheric pressure will let the oil “rest” & those bubbles with almost disappear over the “cure time”. If not, Use a heat gun set to low & held about 12-16" away from the slab. It makes the slab look BEE-UTIFUL when done. Just be careful to not use a super hot heat gun, & to not burn the terps off, or evaporate half of your slab with it. Easy & slow wins this race