Full melt
Full melt describes hash that melts entirely with heat, leaving no plant residue — the purest grade of mechanical separation, typically from the 73u-90u fractions.
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The scale comes from American extractors: hash is rated from one to six stars by how it behaves under heat. At six stars it bubbles and melts like an oil — full melt — proof that the fraction contains almost nothing but trichome heads. Lower grades, which leave ash or residue, betray the presence of plant matter.
Full melt is not a method but a verdict: it is reached by very careful dry sieving or, more commonly, by ice-water separation on narrow meshes (73u-90u). It is the raw material piattella demands, and the benchmark premium hash is measured against.
The grade speaks to mechanical purity, not chemical composition: a full melt can be THC-dominant (illegal in France) just as easily as CBD-dominant. The line that matters on the legal market remains Δ⁹-THC at 0.30% or less on the certificate of analysis.
Full melt and micron: what the mesh announces
The grade is mostly sought on the narrow meshes, 73u and 90u, where the fraction holds the least plant material. The micron tool shows what each bag in the stack collects, and the 45u and 120u ice-o-lator comparison is a reminder that a finer mesh does not guarantee a higher potency: the grade and the batch analysis are read separately.
Further reading.
- Which one to pick
- The lab's hash comparison