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Message: <blockquote data-quote="Pahval" data-source="post: 5197055" data-attributes="member: 345364">Thank you very much [USER=103041]@Icemud[/USER] for this info, this may save someones life, ill spread the word around about this... Ive had my issues with those jars as well, as i saw people use it with pressure cooker, but the rubber/pet seals just dont seem well tought about in my head, im glad you did your test and found out about it... Ill add here what i found out about decarboxylation from 2 studies, which i found most helpful about this, and ill link my google drive folder with all studies i researched, most i discarded as they werent so helpful or were using material i was not interested in (like pressed hemp seeds oil)...[USER=333072]@MITCHELL FLORN[/USER] can you please post new link, this one seems broken?Cannabinoid Decarboxylation: A Comparative Kinetic StudyOverview of the processes involved in cannabinoids transformation...[ATTACH=full]2277411[/ATTACH]This study investigates different temperatures and timings of decarb for all main cannabinoids, both with and without present oxygen.Summary:They used data from oven decarbed herb material to find prediction models of THC and CBD for total decarboxylation, but unfortunately they didnt show the losses you get while going for total decarb, as there will be shown in next study. Prediction model based on decarb kinetic for THC shows that best variables for total decarb are 160°C (320°F) for 6.5 minutes, and for CBD are 90°C (194°F) for 12 hours, 100°C (212°F) for 6 hours, 110°C (230°F) for 3 hours.[ATTACH=full]2277412[/ATTACH]This setpoint may be useful for commercial production, but for home oil producer, it may bring too big of losses to final oil yield...Eyeballing of data graphs for extracted cannabinoids show that the best (meaning not total decarb, but most decarbed yield with some precursor cannabinoids still left) temperature and timing for THC decarb is 140°C (284°F) for 20 minutes, for CBD is 120°C (248) for 50 minutes, for CBG is 120°C (120°F) for 50 minutes also.[ATTACH=full]2277413[/ATTACH]When decarbed at  140°C (284°F) for 20 minutes, THC shows no significant degradation to CBN in any method (thin or thick bed of material, nitrogen filled pouches).[ATTACH=full]2277414[/ATTACH]Decarboxylation Study of Acidic Cannabinoids: A Novel Approach Using Ultra-High-Performance Supercritical Fluid Chromatography/Photodiode Array-Mass SpectrometryThis study is focused on decarb of cannabinoid oil extracts in vacuum oven. Since it involved different material (oil extract vs dry herb from above), some decarb variables are different, but what i found most useful was the data of how much there is a loss of material for CBD and CBG.[ATTACH=full]2277415[/ATTACH]Total THCa decarb is achieved at temps of 110°C, 130°C and 145°C (230°F, 266°F and 293°F) after 30, 9 and 6 minutes, with a loss of total molar concentration at temp of 110°C being 7.94%.[ATTACH=full]2277416[/ATTACH]Since decarb was done in vacuum oven, no oxidative transformation of THC to CBN was seen.[ATTACH=full]2277420[/ATTACH]Total CBDa decarb is achieved at 110°C and 130°C after 45 and 20 minutes, with a loss with first temp being 18.05% and with second 25.2%.[ATTACH=full]2277424[/ATTACH]They also showed how degradation of CBDa happened due to other biological material being present in extract, or some other unknown factors, compared to degradation of pure CBDa.[ATTACH=full]2277423[/ATTACH]Total decarb of CBG was achieved at temp of 110°C after 40 minutes, with loss of 52.67% of total molar concentration.[ATTACH=full]2277427[/ATTACH]My conclusion:I will personally follow data from first study, aiming at highest yield, preserving some carbolyc acid forms as they are also proven to have health benefits, decarbing of herb material before extraction. It seems herb has to be covered with something like a lid or aluminium foil while in oven. Oven temps usually fluctuate about 20°F above and below (11°C) setpoints if undisturbed (not opened), but it shouldnt be a problem.*edit: somehow this post is showing some pictures below, i cannot remove them :/Peace...[ATTACH=full]2277416[/ATTACH][ATTACH=full]2277420[/ATTACH][ATTACH=full]2277423[/ATTACH][ATTACH=full]2277424[/ATTACH][ATTACH=full]2277427[/ATTACH][ATTACH=full]2277416[/ATTACH][ATTACH=full]2277420[/ATTACH][ATTACH=full]2277423[/ATTACH][ATTACH=full]2277424[/ATTACH][ATTACH=full]2277427[/ATTACH]</blockquote>

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