Filtre 90U Hash
Filtre 90U Hash refers to hash made using a 90-micron (90µm) filtration screen during the separation of cannabis trichomes from plant material. The “90U” designation describes the approximate mesh size used during processing, rather than a specific strain or brand.
A 90u (90-micron) hash filter retains particles that are 90 micrometers or smaller, capturing the prime resin glands (trichomes) while blocking unwanted plant material.
What is a 90u Filter?
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- Micron size: The letter “u” (or µ) stands for micron. A 90u screen has tiny holes measuring 0.09 millimeters.
- The “Sweet Spot”: Most mature cannabis trichome heads—which hold the highest concentration of THC, other cannabinoids, and terpenes—measure roughly between 73u and 120u.
- Purity: Using a 90u mesh or extraction bag filters out larger plant stalks, debris, and impurities.
Why 90u Hash is Prize
- Cleaner product: It contains very little vegetable matter, making the hash smoother and cleaner to consume.
- Better flavor: Preserves delicate terpenes for a richer, more accurate taste profile of the strain.
- High melt quality: High-grade 90u dry sift or bubble hash often melts fully when heated, indicating exceptional purity.
90u vs. 120u: Choosing Your Micron
The “sweet spot” for high-quality trichomes is generally between 73u and 120u. When separating hash, choosing between these sizes comes down to a trade-off between absolute purity and total yield:
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- 90u Filter:
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- Purity: Higher purity. It isolates the most mature, isolated trichome heads.
- Yield: Lower yield. It leaves behind slightly larger or smaller trichomes.
- Best For: True “six-star” melt hash and ultra-premium connoisseur-grade rosin.
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- 120u Filter:
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- Purity: Good purity, but allows slightly more variation in trichome sizes.
- Yield: Higher yield. It captures a wider window of resin glands.
- Best For: A great balance of excellent quality and higher volume for daily consumption.
How 90u Hash Rosin is Presse
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- 90u Filter:
Rosins made from a single, isolate micron size like 90u are highly sought after because they melt perfectly clean without leaving residue on your equipment.
- Pre-Chilling and Packing: The 90u bubble hash or dry sift is carefully packed into a food-grade mesh rosin bag (typically a 25u or 37u bag to hold the fine powder). It is pre-presse gently into a flat, uniform brick.
- The “Warm-Up” Phase: The packe bag is place between two heated aluminum plates. The plates are brought together just enough to touch the bag without applying high pressure. This melts the resin glands gently for 30–60 seconds.
- The Squish (Low Temperature / High Pressure): Hydraulic pressure is slowly applied.
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- Temperature: Usually kept low, between 140°F and 170°F (60°C to 76°C) to protect delicate terpenes.
- Action: The golden, liquefied resin escapes through the fine mesh bag and flows onto parchment paper, leaving any remaining organic plant matter trapped inside.
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- Curing: The fresh “live” or traditional rosin is collected, placed into a glass jar, and allowed to cure (either cold-cured or warm-cured) to develop its final, buttery texture and rich aroma.














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