[monkeybrains420]

275 for 25min been doing this for over 20 years .

[Gry]

That burst of flavor one smells when placing canna in an oven always made me wince.
More may be retained if one does the extraction first and then sticks the extract in the oven to decarb - using a foil covered glass container, and allows the container to cool prior to removing the foil.
Back in the mid seventies, buds in the oven was fine, today I use the foil covered container as I am a firm believer in an entourage effect.

[XXX_710]

Originally Posted by BigJohnny

Doesn't THC begin to vapourize at 250F ?

THC boils at 315 degrees F.

xxPeacePipexx seems to have come to the same conclusion i did. Keep the heat from getting above 293F to preserve the most volatile compounds.

Like someone said, get an oven thermometer to confirm your oven's temperature.

[Growcephus]

Lab testing all points to using low heat for the most effective decarb without creating excessive amounts of CBN in the process.

-Heating the product up to 212F-221F and holding it at the temp for even as little as an hour should result in pretty damn close to a 90% conversion rate of THC-A to THC-D9 WITHOUT creating a bunch of CBN in the process. You can achieve this using mason jars with loose lids in a water bath if you're not confident in the stability of your oven.

-Holding the product at any temp from 212F to 302F for at least an hour has been demonstrated to achieve pretty close to a 90% conversion rate, however, CBN conversion accelerates with the higher temps.

While decarboxylation has peer reviewed studies we can reference, there is pretty much zero peer reviewed data on extracting our decarbed THC to solvents or fats for use in edibles. I'd recommend doing a two stage process and decarb your weed first at 212F, then extract it into your solvent/fat using low heat again and test samples done using 1, 2, and 3 hour extraction durations as the low heat should help prevent excessive CBN development during the extraction.

Here's some data on the decarb process: