What Does Open-Loop Extraction Mean?
In the cannabis extraction industry, open-loop extraction is the opposite of closed-loop extraction. It typically refers to an open-tube butane run.
For example, making butane hash oil (BHO) in an open-extraction system involves placing the plant material into an open-ended tube and running the butane through the tube and across the plant material to extract the concentrated oil of the plant fiber.
Using open-loop extraction exposes the final concentrate product to the butane that is being used as the solvent. This causes the cannabis concentrate to contain a solvent residue.