Vaporization Temperature Bands: An Industry Reference

The band table contested

The bands below are the practical working reference: the temperature region in which a compound class is observed to come off plant material in a dry-herb vaporizer. They are NOT neat-compound boiling points. A compound present as a dilute component of a plant matrix evaporates at its partial pressure, well below its pure boiling point, which is why the monoterpene band starts near 155 degrees Celsius while several monoterpenes boil above 170. The operator bands come from the Temple Pharmacopoeia and are consistent with the vaporizer validation literature.

Contested — caveat. Band edges are conventional and approximate, and they overlap. Different sources give edges several degrees apart. Use them to reason about sequence and about what you are losing, not as precise thresholds.

Sources: Van Kush Family Research Institute (operator) 2026* · Lanz C 2016 · Gieringer D 2004 · Moir D 2008 · Compiled from public compound databases (PubChem 2026*

Specific compounds from the operator inventory contested

The operator's Temple Pharmacopoeia includes two non-cannabis compounds with directly practical thermal behaviour, and both are worth putting on an industry page because they are the kind of detail that decides whether a blend makes sense at all.

Contested — caveat. The scoparone and L-DOPA figures are from the operator document without a primary thermal-analysis citation. The L-DOPA degradation direction is well established and consistent with the compound class; treat the 200 degrees Celsius figure as approximate.

Sources: Van Kush Family Research Institute (operator) 2026* · Gertsch J 2008

Caveat 1: the dial is not the material in vitro

A vaporizer set-point is a target for a heater or a heated air stream, not a measurement of the plant material. Actual material temperature depends on the sensor location, the control loop, the thermal mass of the oven, the packing density of the load, the draw rate and the ambient temperature, and it is routinely tens of degrees away from the displayed number — in either direction, and it changes during a session. Lanz and colleagues validated vaporizers in vitro and found substantial device-to-device differences in delivered cannabinoid quantity at nominally comparable settings, which is the same phenomenon viewed from the output end. The practical consequence: a set-point number is meaningful as a repeatable control on one specific device, and is nearly meaningless transferred between devices. Never treat a temperature recommendation from one device as a specification for another, and never treat a set-point as an analytical parameter.

Sources: Lanz C 2016

Caveat 2: conduction and convection devices are not interchangeable contested

In a conduction device the material sits against a hot surface and heat moves inward by contact, so the load has a steep internal gradient: the material touching the wall can be well above the set-point and scorching while the centre is below it and barely volatilising. In a convection device heat arrives with the drawn air, so the temperature the material sees is tied to airflow — a slow draw delivers less heat than a fast one, and the effective temperature is a function of how the user inhales. Hybrid devices split the difference. The same numeric set-point therefore produces genuinely different chemistry in the three architectures, and this is a large part of why user temperature recommendations do not transfer. For anyone writing a product instruction or a study method, the device architecture and the draw protocol are part of the specification, not incidental details.

Contested — caveat. The conduction and convection contrast is a heat-transfer argument supported by the device-variability findings in the validation literature rather than by a dedicated head-to-head chemical study cited here.

Sources: Lanz C 2016 · Gieringer D 2004

Caveat 3: the first draw and the last draw are different products contested

Terpene loss during a session is progressive and sequential, not uniform. The lowest-boiling compounds leave first and are depleted from the load before the higher-boiling ones have begun to come off in quantity. So the first draw of a session is monoterpene-rich and cannabinoid-poorer; the last draw is cannabinoid-and-sesquiterpene-weighted and has almost no monoterpene left, because the alpha-pinene and myrcene are already gone. Two consequences follow. First, aroma and effect drift within a session by chemistry, not by imagination, and a user who reports that a device is harsh or flat at the end of a bowl is reporting something real. Second, a study or a product claim that reports a single composition for "the vapour" has averaged over a changing mixture and has lost the information that matters. If a protocol matters, fractionate: collect and analyse draws separately. The same logic explains why stepping a session up through the bands — starting in the monoterpene band and finishing in the sesquiterpene band — recovers more of the total volatile profile than running a single high set-point, which destroys the monoterpenes on the way.

Contested — caveat. The sequential-depletion account follows from differing volatilities and is consistent with the vaporizer validation literature, but this shelf does not cite a dedicated per-draw compositional study. Treat the direction as sound and the magnitude as unquantified.

Sources: Lanz C 2016 · Gieringer D 2004 · Compiled from public compound databases (PubChem 2026*

Caveat 4: above roughly 230 degrees Celsius you are burning it in vitro

The upper bound on this table is not a preference, it is a chemistry change. Above roughly 230 degrees Celsius plant material moves from volatilisation into pyrolysis, and pyrolysis generates compounds that were not present in the material at all: benzene, polycyclic aromatic hydrocarbons, carbon monoxide, and tars. Moir and colleagues characterised mainstream and sidestream smoke from cannabis and tobacco cigarettes under machine smoking conditions and documented this toxicant profile. Gieringer, St. Laurent and Goodrich reported the contrast from the other direction: a vaporizer delivered cannabinoids while suppressing the pyrolytic compounds. The point for this shelf is that the toxicant question is governed by temperature and not by the label on the device — a vaporizer run hot enough is producing combustion products, and a dial that reads 210 degrees Celsius on a device whose hot spots run 60 degrees above set-point is producing them too. This is also the reason the operator document's observation about Imphepho smoke matters: research found that smoke condensates from burning the plant contain different compounds than solvent extracts of it, because combustion creates new chemistry. Vaporization within the bands is an attempt to avoid creating that chemistry; exceeding them abandons the attempt.

Sources: Moir D 2008 · Gieringer D 2004 · Van Kush Family Research Institute (operator) 2026* · Lourens ACU 2008

Caveat 5: decarboxylation is a rate, not a switch contested

Cannabinoid acids lose carbon dioxide to give the neutral cannabinoids, and this is the single most consequential reaction in the warm-up phase of any vaporization session. It is kinetics, not a threshold: the rate rises steeply with temperature, so decarboxylation proceeds slowly at low temperature over long times and fast at high temperature over short times, and any statement of the form "decarboxylation happens at X degrees" has omitted the time axis. Two practical consequences. First, on inhalation timescales the conversion is substantially complete within the warm-up and lower monoterpene bands, which is why inhaled cannabis delivers neutral cannabinoids from acidic starting material. Second, the conversion is never quantitative and some product is lost onward to cannabinol by oxidation, which is exactly why the total-THC arithmetic on the COA shelf is a theoretical ceiling rather than a prediction of delivered dose. The boiling points commonly quoted for THC and CBD themselves — around 157 degrees Celsius for THC is the usual figure — deserve the same scepticism this shelf applied to humulene: they are reduced-pressure or extrapolated values that circulate as though they were atmospheric boiling points, and a vaporizer does not need to reach a cannabinoid's boiling point to volatilise it from a matrix.

Contested — caveat. The commonly cited THC boiling point near 157 degrees Celsius is not a well-founded atmospheric value and should not be used as a device set-point rationale. Decarboxylation kinetics vary with matrix, moisture and heating profile; no single temperature figure describes it.

Sources: Gieringer D 2004 · Lanz C 2016 · Compiled from public compound databases (PubChem 2026*

How to use this page

For a formulator choosing between a vaporizable botanical and a liquid or oral format, read the band table against what you actually want delivered: if the active is a monoterpene or a sesquiterpene, a dry-herb route is viable; if it is a water-soluble amino acid like L-DOPA, it is not, and the Mucuna row is the worked example. For a lab tech designing a delivered-dose experiment, the four caveats above are the method section: specify the device architecture, the set-point, the load mass and packing, the draw protocol, and whether draws were pooled or fractionated, because without those the number is not reproducible. For a buyer or a retail educator, the honest short version is: lower bands preserve aroma compounds and deliver less per draw; higher bands deliver more and destroy the light terpenes; above roughly 230 degrees Celsius the device is a combustion device whatever it says on the box.

Sources: Van Kush Family Research Institute (operator) 2026* · Lanz C 2016 · Moir D 2008