Cannabinoid Extraction Methods
This is a natural method of extracting compounds by sifting trim and shake through a fine-weave screen filter. This solvent-free process does not always produce the cleanest or most effective results.
This method uses ice, screens of different micron sizes, and agitation to remove trichomes. While slightly more effective than dry sieve, there is a danger of mold growth if the extract is not dried thoroughly.
This is a very effective, although expensive, extraction method that does not use solvents and creates a clean and pure product.
Due to the ability to dissolve waxes, Isopropyl alcohol is best used as a quick wash to increase the purity of the cannabis extract.
The two-wash Quick Wash Ethanol, or QWET, process is probably the most common and easily executed extraction process. The first wash can extract 75 to 80% of the oil, the second extracts most of the balance.
When performed safely in a laboratory, butane and propane extractions are inexpensive and create clean, potent products. Either solvent is easily purged.
Although an effective solvent, hexane is more toxic than butane, and is insoluble in water, extremely flammable, and potentially explosive.