WT · Carrier register
Carrier dossier: Wax tablet
A pressed wax disc with no liquid, no vessel to break and no way to overshoot by spilling. Its output tracks room temperature almost exactly, which makes it either the most predictable or the least predictable carrier in the register depending entirely on which room you put it in.
By The Scent Desk·Published 2026-08-31
| Medium | pressed fragrance wax, typically 40-80 g, often in a shallow tin or on a cord |
|---|---|
| Release mechanism | scent released from the wax surface at room temperature, output driven by ambient temperature |
| Where it wins | no liquid, no spill risk, can be moved room to room in seconds, output fades predictably |
| Where it fails | output collapses below 18 C, softens and marks surfaces above 30 C, single-use per pour |
| melt band c | 46–62 |
| weight g | 40–80 |
| release window hours | 360–1100 |
| re melt cycles | 0–6 |
| coverage m2 | 4–14 |
Melt band is the only spec that really matters
The melt band sets the temperature window the tablet works in. There are four common bands:
| Melt band | Room temperature | Behaviour |
|---|---|---|
| 40-44 C | 16-22 C | High output; surface goes tacky above 26 C |
| 46-50 C | 18-26 C | The general-purpose band; study, bedroom, living room |
| 52-56 C | 20-30 C | Lower output but very steady; good for air-conditioned summers |
| 58-62 C | 24-34 C | Low output; hot climates only, and it must be fixed in place |
Choosing the wrong band has a specific outcome rather than a vague one. A 46 C tablet in a 30 C room stays tacky on the surface, collects dust for two weeks and ends up a grey-black slab. A 60 C tablet in a 20 C bedroom can be quiet enough to read as nothing at all.
How much output moves with temperature
Measured, a wax tablet gains 4-6% output for every degree of ambient temperature. That means:
- A bedroom going from 20 C to 26 C on a summer night gains about 25%.
- An uncooled living room going from 18 C to 32 C on a hot afternoon gains more than 60%.
- A heated flat dropping from 24 C to 18 C overnight loses about 30%.
The conclusion is that a wax tablet suits stable rooms. In any space that swings more than 10 C, the read becomes conspicuously uneven and the lid becomes a necessary control rather than a convenience.
Re-melt cycles
"Re-meltable" means the wax can be heated back to liquid, loaded with fresh fragrance and re-poured. How many times depends on the wax base:
| Wax base | Re-melt cycles | Release window per re-pour |
|---|---|---|
| Soy | 4-6 | 85% of the first pour, then minus 10% each time |
| Paraffin blend | 2-4 | 70% of the first pour |
| Palm blend | 3-5 | 80% of the first pour |
| Beeswax blend | 1-2 | 60% of the first pour |
To re-pour: heat over water to 8-10 C above the melt point, take it off the heat, add fragrance at 3-5 ml per 50 g of wax, stir for thirty seconds, pour into the mould and leave four hours. Heating too hot drives most of the fragrance off before the pour and is the single most common way to waste a re-melt.
Container compatibility and cleaning
- Shallow tin. The best option, because the lid is the best tuning control you have. Closed, output drops by about 60%.
- Porcelain dish or glazed tray. Workable, but there is no way to throttle it.
- Wooden tray. Not usable. Above 30 C the wax bleeds a little oil and the mark it leaves in the grain is permanent.
- Fabric or paper. Not usable; the oil transfers.
- Cleaning. Wipe off the bulk with paper towel while cold, then wash in water above 60 C. Cold water does nothing. Never scrape with a blade — it damages the glaze.
Changing direction, and replacing
A wax tablet cannot be topped up; it is replaced whole or re-poured. When changing direction the container must be cleaned thoroughly, because wax crumbs left in a tin mix with the new pour and produce a middle note that resembles neither. A shallow tin comes clean after ten minutes in hot water with a drop of neutral detergent.
When not to choose it
- Where ambient temperature sits above 30 C or below 16 C for long stretches — cars, uncooled rooms, unheated stores.
- Where the replacement date needs to be exact. Wax decay is gradual, and the last week of a tablet's life reads at about 40% of the first.
- Where there is a strong local heat source. Nothing within 50 cm of a radiator, a lamp shade or an equipment exhaust.
Refill and replacement
There is nothing to top up. When the surface goes dull and stops reading at arm's length, re-melt it with a fresh scent load or retire it to a drawer liner.
Plans using this carrier
| Rooms | Rung | One fill lasts | Running cost |
|---|---|---|---|
| Bedroom | L2 | 30 d | CNY 19 |
| Study | L2 | 26 d | CNY 17 |
Assembly, in order
- Unwrap and stand it face up — Take the tablet out of its tin or off its cord and set it on a saucer with the widest face upward. Dust settles on the warm face and dulls it faster than the underside ever does.
- Give it a warm hour — Room temperature is what drives the output. Below 18 C the tablet goes quiet; above 30 C it softens and leaves a mark on whatever it stands on.
- Rotate a quarter turn every ten days — Turn the tablet a quarter turn every ten days and flip it once at the halfway point of its life. The face that has been up releases measurably faster than the one that has been down.
- Retire or re-melt — When the surface goes dull and stops reading at arm's length, either re-melt it with a fresh load or move it into a drawer as a liner. There is nothing to top up in place.