When to Add Essential Oil to Soy Wax

The short answer

Add essential oil after the soy wax has fully melted and reached the temperature your wax manufacturer recommends, then stir gently but thoroughly and pour once the wax cools to its pouring temperature. Supplier tutorials commonly place the addition temperature somewhere between roughly 160 and 185 degrees F (about 70 to 85 degrees C). Because every soy wax is a little different (see types of soy wax), follow the instructions for your specific wax first, and use these figures as a general guide.

Why timing and temperature matter

• Too cool: the oil may not bind properly to the wax, which can lead to weaker scent throw or oil seeping out of the finished candle.
• Too hot: essential oils are heat-sensitive, and some of the aroma can evaporate before the candle is even poured.

That is why the sequence matters: melt, add oil in the recommended window, stir, cool to pouring temperature, pour.

Step by step

1. Weigh the wax and melt it using a double boiler or other gentle heat.
2. Prepare the containers. Clean them and secure a centered wick.
3. Weigh the essential oil. Use a scale rather than drops. See the essential oil to wax ratio guide for amounts.
4. Add the oil at the recommended temperature. One well-known supplier tutorial adds the oil at 185 degrees F (85 degrees C) and stirs for two minutes. Another guide suggests the range of about 160 to 185 degrees F.
5. Stir gently for about two minutes so the oil is fully incorporated.
6. Let the wax cool to pouring temperature. The same tutorial pours at about 135 degrees F (57 degrees C); another suggests roughly 120 to 140 degrees F.
7. Pour, secure the wick, and let the candle cool completely.
8. Trim the wick and cure. Suppliers suggest anywhere from about 12 days to 2 weeks before burning.

Flash point and essential oils

An oil’s flash point is the temperature at which it can begin to give off vapors that may ignite. Oils vary widely. Some guidance suggests adding fragrance when the wax has cooled to just below the oil’s flash point. Check the flash point listed for your oil and keep it in mind, particularly with citrus or other volatile oils, and always melt wax with careful temperature control.

How much to add

Total load depends on your wax and oil. Many guides start essential oils somewhere around 5% to 6% of the wax weight, but check your supplier’s recommendations. For a 4 oz candle, the count in drops is not a reliable measure, because drop size and oil density vary. Weigh the oil instead.

Getting a stronger scent throw in soy candles

• Add the oil in the recommended temperature window, not earlier or later.
• Stir long enough for full incorporation.
• Allow a full cure time.
• Test different loads within what your wax can hold.
• Choose oils that tend to hold up in heat. See our list of the strongest essential oils for candles.

Can you add too much?

Yes. Excess oil can separate and pool, make the wax struggle to set, or affect how the wick burns. Stay within your wax’s stated maximum load.

Troubleshooting

• Weak scent: try a slightly higher load within limits, a longer cure, or a different oil.
• Oil beads on the surface: the load may be too high, or the oil may not have blended fully.
• Scent smells different when burning: essential oils can shift under heat, which is why testing each oil matters.

For a wider look at making your own scents, see our guide to DIY fragrance oil for candles.