YES! No solvents! EVER! I’ve found that about a 6:1 ratio of headspace to product GENERALLY keeps you under 200psi.
GENERALLY. That’s why they make PRVs…
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Decarbing under vacuum can definitely strip away those lighter, more volatile compounds that give your oil its character. While it’s great for keeping things clean and preventing oxidation, the low pressure often pulls out the very things you’re trying to save. You might have better luck adjusting your temperature or reducing the vacuum depth once you hit the reaction point.