Premium · Licensed · 21+
Age Verification
You must be 21 years old or 18 years old with a medical card to access this website.
Are you eligible?
We're sorry!
You're not old enough to visit Weevader. Please come back when you're 21.
You must be 21 years old or 18 years old with a medical card to access this website.
Are you eligible?
You're not old enough to visit Weevader. Please come back when you're 21.
The solventless movement has taken the cannabis concentrate world by storm. More consumers than ever are seeking extracts made without chemical solvents like butane, propane, or CO2 — and for good reason. Solventless concentrates deliver pure, unadulterated cannabis flavor while eliminating any concern about residual chemicals. Here's everything you need to know about this rapidly growing category.
Traditional cannabis concentrates rely on chemical solvents to strip cannabinoids and terpenes from plant material. While modern purging techniques remove the vast majority of these solvents, trace amounts can remain. Solventless extraction eliminates this concern entirely — the only inputs are water, ice, heat, and mechanical pressure.
Beyond purity, solventless methods tend to preserve a more complete terpene and cannabinoid profile. Chemical solvents can degrade or alter certain terpenes during extraction, while solventless techniques keep the original chemical composition intact. The result is a concentrate that more faithfully represents the source plant's genetics.
Dry sift is one of the oldest and simplest extraction methods. Cannabis flower is gently agitated over a series of fine mesh screens, causing trichome heads to separate and fall through. The collected powder — commonly called kief — ranges in quality from cooking-grade to near-full-melt depending on how many screens are used and how fine they are.
High-quality dry sift uses multiple passes through progressively finer screens (typically 120 to 45 microns) to isolate the purest trichome heads. The best dry sift approaches full-melt quality and can be pressed into rosin for even greater refinement.
Bubble hash uses ice water agitation to separate trichomes from cannabis. The flower is mixed with ice and water in a vessel, then stirred or agitated to break trichome heads free. The mixture is filtered through a series of mesh bags (bubble bags) ranging from 220 microns down to 25 microns, each bag capturing different-sized particles.
The best trichome heads typically collect in the 73-120 micron range. After collection, the hash is carefully dried — usually by microplaning it onto parchment paper and placing it in a freeze dryer. Proper drying is critical; moisture trapped in the hash leads to mold and degraded quality.
Rosin is made by applying heat and pressure to cannabis material — flower, hash, or kief — to squeeze out a golden oil. Home enthusiasts can make rosin with a hair straightener, while commercial producers use hydraulic rosin presses capable of applying 10-20 tons of pressure at precisely controlled temperatures (typically 170-220°F).
Hash rosin (rosin made from bubble hash or dry sift rather than flower) is considered the pinnacle of solventless extraction. Starting with already-purified trichome heads produces a concentrate with exceptional purity, flavor, and potency. Explore concentrates at top-rated products.
Solventless concentrates are graded on a star system based on how cleanly they melt when heated:
Here's a simplified overview of the most common commercial solventless process (ice water hash to live rosin):
Solventless concentrates command premium prices due to lower yields and more labor-intensive production. A single wash of fresh-frozen material may yield only 3-8% of the starting weight in hash, and pressing that hash into rosin reduces the yield further.
Check current deals for discounts on premium concentrates at dispensaries near you.
While properly purged solvent-based concentrates are considered safe by regulatory standards, solventless products offer additional peace of mind for health-conscious consumers: