A refinement process used to remove fats, waxes, and lipids from extracts. The winterization of oil purifies crude extracts, increasing the quality and flavor of the resultant oil. Cannabis winterization is achieved by mixing  cannabis extract with ethanol and freezing the solution to allow the undesirable compounds to solidify. The solution is then passed through a filter, separating, or winterizing, wax, lipids, and fats from the oil. The final step involves removing the ethanol from the solution. The finished product of winterization, also known as de-waxing, is considered a winterized extract. 

How to winterize BHO

Winterization can also be used to clean up butane hash oil (BHO), one of the most popular cannabis concentrates. BHO is also sometimes referred to as butane honey oil, for the yellow-gold color it takes on after the butane has been purged.

BHO extraction can be risky and is a job best left to experts. Winterizing BHO can be done at home; however, it should be performed with appropriate caution. The winterization process for BHO requires the butane extract to be blended with ethanol. The solution is then frozen to force undesirable substances to become suspended, so they can be effectively filtered out. If the product is still suboptimal, these steps can be repeated until the solution becomes a golden wash. Finally, the ethanol must be purged from the solution.

Winterized BHO is available in a range of different consistencies, such as shatter. Winterized shatter is a cannabis concentrate that is translucent, glass-like, and very potent. 

Winterizing CO2 extracts

Winterization can also be carried out on cannabis concentrates that have used liquid carbon dioxide as a solvent instead of butane. The process of winterizing CO2 oil is very similar to the process used for winterizing BHO.

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The information contained in this site is provided for informational purposes only, and should not be construed as medical or legal advice. This page was last updated on July 14, 2021.