In cannabis terminology, solventless describes concentrates made through mechanical separation rather than extraction with solvents such as butane, propane, ethanol or CO2. Dry sift, ice-water hash and rosin are common examples. The word describes a process. It isn't a blanket safety or quality certification.
The language is industry shorthand. Water is a solvent in chemistry, but ice-water hash is called solventless because cold water and agitation knock resin glands loose rather than dissolving the target compounds out of the plant. Lowtemp's bubble hash and rosin comparison names butane, propane, ethanol and supercritical CO2 as the solvents these mechanical methods avoid.
Different mechanical routes
Dry sift uses screens. Ice-water hash uses cold water, agitation and filtration. Rosin uses heat and pressure on flower or hash. Lowtemp's format overview describes these routes and draws the contrast with solvent-based extracts, which it describes as dissolving cannabinoids and terpenes into a solvent and purging the residual solvent afterward. The mechanical routes can produce very different finished textures, so “solventless” is a broad family description.
That purge step is why “solvent-free” isn't a synonym. A seller could use it to describe a finished solvent-based extract rather than a mechanical process. Ask which process a producer means rather than treating the two phrases as interchangeable.
What the word cannot promise
Solventless doesn't mean chemical-free: cannabinoids, terpenes and water are chemicals. It also doesn't establish that the starting cannabis was free of pesticides, microbes or heavy metals. Mechanical processing isn't a substitute for appropriate production controls and testing.
California requires every batch of cannabis goods to be tested before sale, with results on a certificate of analysis. The detailed testing rules determine which analyses apply to each product. Terpenoid testing, for example, is performed if requested under §15725; do not treat the overview’s category list as an identical test panel for every product. A process claim and a batch's test result answer different questions. Neither guarantees a person will enjoy the product or experience no adverse effects.
Why someone might still care about the process
A buyer may prefer the craft of mechanical separation, a particular producer's work or the flavor of a specific jar. A grower may value how a product communicates the source material. Those are legitimate preferences without claiming that the entire solventless category is superior.
The rosin-versus-resin guide compares the process language. For an actual purchase, pair the process word with the cultivar, producer, batch, finish and storage instructions.