Full Melt Hash Potency: THC Range and What Drives It

Short answer

Full melt hash tests in the 50% to 80% THC range on most lab reports. Six-star lots land at the top of that band. Five-star lots sit near 60%. A sample below 50% THC points to plant matter or immature trichomes in the mix, not full melt.

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These are ranges, not guarantees. Two washes of the same cultivar can test 12 points apart. The number depends on trichome maturity, sieve size, genetics, and how the material was dried.

Cannabis Full Melt Hash Quality: A Practical Guide

What full melt means

Full melt is ice water hash that melts to a near-clear liquid on a hot surface and leaves little char. Graders score it one to six stars. One to three stars bubble and darken. Five and six stars melt clean. The star score is a visual test. It is not a potency test, though the two track together because both depend on trichome quality.

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Potency by grade

• Three star: about 25% to 40% THC. Plant matter present.
• Four star: about 40% to 55% THC. Partial melt.
• Five star: about 55% to 70% THC. Full melt on a nail.
• Six star: about 65% to 85% THC. Clear melt, minimal residue.

Rosin pressed from full melt hash tests higher, often 70% to 85% THC, because pressing removes water and residual fiber.

What moves the number

• Trichome maturity. Clear heads hold acidic cannabinoids. Amber heads carry more CBN. Harvest timing shifts the ratio.
• Sieve size. The 73 to 90 micron bags catch ripe heads. Wider bags pull in stalk and leaf.
• Genetics. A cultivar that tests 28% THC in flower has more THC to concentrate.
• Wash time. Long agitation breaks heads and releases chlorophyll.
• Drying. Freeze-drying preserves structure and limits oxidation. Slow air drying loses terpenes and some THC.

Full melt vs other forms

Dried flower runs about 15% to 30% THC. Kief runs about 20% to 40%. Standard bubble hash runs about 20% to 60%. Full melt sits at the top of the hash band. Distillate and live rosin test above it, but they are different products with different processes.

Reading the COA

Check total THC, not delta-9 alone. Total THC equals delta-9 THC plus THCA multiplied by 0.877. Check the moisture line. Check microbials and pesticides. A water-only product should show no solvent residue. Ask for the batch number and the test date. Potency on a 14-month-old COA tells you little about the jar in front of you.

Dosing and storage

Full melt is a concentrate. A 25 mg piece can carry 15 mg of THC. New users should start at 5 mg to 10 mg THC and wait two hours. Store the hash sealed, cold, and dark. Terpenes degrade at room temperature. Use within six months for best flavor.