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Hash micron grades: 120u, 90u, 73u, 45u

What each 25 to 220 µm sieve keeps from a trichome harvest, depending on the size of the heads and how fresh the material is.

Eight sieves laid on a bench after a wash, from the 220 µm work bag to the finest, 25 µm, each with its own mesh. Each holds, as a cake of resin, the share of trichome heads it stopped; the bag being read is pink. In front, a micron rule: a pin at each mesh size, the rider at the heads' median diameter.

The sieves

Left to right: 220, 190, 160, 120, 90, 73, 45 and 25 µm. On the rule, one mark is 10 µm.

120 to 160 µm

The 120u bag keeps 50 % of this harvest's heads.

Grade read

Head size

Measured mean diameter of fresh heads: 80 µm on industrial hemp, 129 µm on strains bred for resin (Small and Naraine, 2016).

State of the material

Dried, a head loses 15 % of its diameter in the first month and 24 % in the first year: it drops one bag.

The 120u keeps the largest heads, often still carried by a piece of stalk. On a strain with large glands, it collects the most.

The eight bags, from the widest to the finest

220u · over 220 µm0%
190u · 190 to 220 µm2%
160u · 160 to 190 µm11%
120u · 120 to 160 µm50%
90u · 90 to 120 µm32%
73u · 73 to 90 µm3%
45u · 45 to 73 µm0%
25u · 25 to 45 µm0%
Under 25 µm, gone with the water0%

Method and limits

A sieve stops whatever is wider than its mesh. In the standard stack of eight bags, each bag therefore keeps what went through the bag above without going through its own: the 90u, the heads from 90 to 120 µm. Those windows are geometry; the share of the harvest that falls into each depends on the size of the heads.

The reference diameters come from Small and Naraine (Genetic Resources and Crop Evolution, 2016): 80 µm on average on industrial hemp, 129 µm on strains bred for resin, and a shrinkage of 15 % in the first month after harvest, 24 % in the first year. The spread around the mean is not published, so the model assumes it log-normal, about ± 20 %. A hash sold as “120u” may also combine two neighbouring meshes: no standard governs the notation.

“3x filtered” hash is dry-sifted in three passes; frozen starts from plants frozen fresh, whose heads kept their size; static sorts the powder with static electricity. Further reading: 90u or 120u, which micron to choose, 120u in the lexicon, and in the catalogue the Iceolator 120u, the Frozen and the 3x filtered.

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