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The primary goal of any extraction method is to separate the cannabinoid-rich resin of the cannabis plant from the inert plant matter. In the dry ice kief separation process, dry CO2 literally freezes the resin glands on the plant, making them easy to shake loose from foliage.These frozen glands fall through a 120- to 220-micron mesh sieve and are collected in a container below. Done properly, CO2 extraction is exceptionally efficient, and the most common method of small-scale CO2 extraction is dry-ice separation. A Few Notes on Dry Ice Dry ice is actually solidified CO2 gas.  It’s super cold, because the freezing point of CO2 is very low, and it must be kept in specialized freezers that are even colder. When not kept in a frozen state, dry ice doesn’t melt — it “sublimes” or “sublimates.” That means it transforms directly from a solid to a gas without going through a liquid state. This unique feature, along with its super-cold temperature, makes it ideal for CO2 separation. As a safety note, remember that dry ice is so cold that it can cause frostbite on contact, so always handle with gloves and wear eye protection. Getting Started The following step-by-step technique is excellent for processing and preserving large quantities of leaf and small buds that might otherwise go to waste. In simple experiments, this method yields 15 to 18 percent of the source material’s weight in the final product —kief. As with any kief or concentrate, that final product is contingent on the original buds. Resinous buds make the best kief. Lower-quality leaf and buds make lower-quality kief. The final product can be of many grades, but the first few shakes will always yield the highest quality. These smaller sieves (120, 160, etc.) let less green matter through. Larger mesh (200, 220,…

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Source : Demystifying the Dry Ice Kief Separation Method

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