The Load
IFRA 51 caps, family by family, without the marketing.
Candle formulation is drowning in folklore. Twelve percent is better than ten percent. Coconut throws harder than soy. A pinch of stearic acid fixes everything. Some of that is true in narrow conditions. Most of it is repeated because it sounds like expertise.
This section replaces the folklore with three curves and one matrix. Once you can read them, you can predict a recipe on paper before you pour it.
The load bell curve
Hot throw does not scale linearly with fragrance load. In my own tests it rises from around four percent, tends to peak in the eight to ten percent range for most soy container blends, and then falls as the wax loses the ability to hold and release the extra oil. The curve on this spread is drawn from repeated test-pours in my own workshop, not from a published data set. It is why a candle at twelve percent often throws worse than the same candle at ten.
The peak shifts by wax. In my tests coconut apricot blends have tended to peak a little higher, and paraffin often a little lower, which surprises people. Treat the numbers as a starting point and find the peak for your specific wax and fragrance before you fight them.
Cure curves by wax
Paraffin plateaus at day seven. Coconut blends hit their stride at day ten. Soy is still improving at day twenty-one. If you judge all three at day fourteen, paraffin looks best and soy looks flat. Judge each wax on its own timeline or you will keep choosing paraffin for the wrong reasons.
Wax choice on evidence
The wax comparison matrix scores five common waxes on adhesion, throw, ease of use, cost per kilo, and sustainability. There is no winner. Soy wins on sustainability and loses on speed. Paraffin wins on throw and loses on marketing. Coconut wins on the balance and loses on the price per kilo.
Pick the wax that fits the story you can honestly tell about your brand, then run the load bell for that specific wax. Do not chase the wax an Instagram maker with different economics is chasing.
Nose fatigue is real
You cannot smell your own candles after twenty minutes. The receptors saturate and you start rating everything as weak. The nose fatigue clock on this page is my cheat sheet. Test in the first ten minutes of walking into the room, or after a fifteen-minute break with a cup of coffee. Never test back to back.
Formulation is measurement plus patience. Skip either one and you are guessing in a lab coat.
Wax family library
The matrix below distils the manufacturer TDS values that actually drive a formulation decision. Melt point governs your pour window. Recommended maximum load caps your bell curve. Cure plateau tells you when to judge the candle. Congeal point predicts how quickly the top skins and where you will need a heat gun.
- Cargill NatureWax C-3 (soy)
- Melt 50°C. Max load 10%. Cure 14–21 d. Pour 60–68°C. Adhesion soft, throw mid.
- CandleScience Golden Wax 464 (soy)
- Melt 47°C. Max load 12%. Cure 10–14 d. Pour 57–63°C. Frosts more than C-3.
- Kerax KeraSoy 4130 (soy)
- Melt 47°C. Max load 10%. Cure 10–14 d. Pour 60–70°C. UK/EU staple; pair first with 4Candles CL, TB or TCR before Stabilo/CD.
- Coconut-apricot blend
- Melt 52°C. Max load 12%. Cure 7–10 d. Pour 60–65°C. Best cold throw of the five.
- Paraffin 4794 blend
- Melt 57°C. Max load 12%. Cure 5–7 d. Pour 70–77°C. Highest hot throw ceiling.
Cure plateaus, in numbers
You do not have to trust the curves on the facing page. The plateaus are documented on the manufacturer sheets. Judge each wax on its own timeline and the wax comparison stops feeling like a personality test.
Scent throw diagnostics
Weak throw is almost never a fragrance-quality problem. It is a wax problem, a load problem, a cure problem, or a wick problem, in that order. Work down the matrix before you email the supplier.
| Symptom | Likely cause | Fix | Prevent |
|---|---|---|---|
| No hot throw, strong cold throw | Wick under-sized. Melt pool too shallow to volatilise oil. | Move up one wick size and re-run the 4-burn protocol. | Confirm melt pool reaches 8 mm–12 mm by burn three. |
| No cold throw | Under-cured, or load below the bell curve threshold. | Wait to the wax's plateau. If still flat, raise load by 1% and re-pour. | Log day 7 / 14 / 21 sniff scores per wax. |
| Fragrance seeping to the surface | Load above the wax's binding ceiling, or added outside the supplier's recommended addition temperature without a full 2-minute stir. | Drop load 1% and add fragrance at 82°C. Stir two full minutes. | Never exceed the TDS maximum. Time the stir with a phone timer. |
| Discoloured top or amber halo | Vanillin or high-molecular-weight aromatic; UV or oxidation. | Add UV inhibitor at 0.1% or move to opaque vessel. | Flag vanillin-heavy fragrances on the batch record. |
| Fragrance smells muddy after a week | Two top-note fragrances competing, or IFRA Cat 12 breach dulling character. | Re-check the IFRA certificate for the specific material and cap accordingly. | Keep a single top-note lead per candle. Chase depth with base notes, not more top. |
The fragrance is not the recipe. The wax, the load, the cure and the wick are the recipe. Fragrance is what the recipe carries.
Waxverse Studio