A fragrance oil's flash point is one of the most misread numbers in candle making. Makers see a temperature on the bottle, picture their wax catching fire on the stove, and worry they have bought something dangerous. The number is real and worth understanding, but it does not work the way that fear suggests. Flash point is the lowest temperature at which the oil gives off enough vapor to ignite if it meets a spark or open flame[1]. It governs how you handle the raw oil and how a carrier can ship it. It does not mean your candle will burst into flames.
We field this question often, so this guide lays out what the number is, where to find it, how it affects your candles and your gel work, and why it sometimes changes your shipping options. We carry over 275 fragrance oils, and every one lists its tested flash point on the product page and on the back of the bottle.
What a Flash Point Is
Flash point is the lowest temperature at which a liquid releases vapor in a high enough concentration to form an ignitable mixture with the air just above it[1]. At that temperature the vapor can flash if a spark or flame is present. Below it, there is too little vapor to ignite.
Regulators sort liquids by this number. Under federal workplace rules, a liquid with a flash point at or below 140°F is a flammable liquid, and one above 140°F is a combustible liquid[1]. Fragrance oils span both groups, which is why two oils that smell equally strong can carry very different flash points and very different shipping rules.
Where to Find the Flash Point
Every Lone Star fragrance oil lists its flash point in two places: the specs on its product page and the printed label on the back of the bottle. You do not have to test for it or look it up elsewhere.
The label also carries the IFRA maximum usage levels, which cap how much fragrance you can use in each application based on a safety review of the material[3]. Real usage depends on both the application and the base it goes into, so treat the IFRA figure as a ceiling rather than a target.
How Flash Point Affects Your Candles
For container and pillar work, the flash point rarely changes anything you do. You add fragrance to melted wax at around 180°F and stir for two full minutes. Many oils have a flash point below that temperature, and that is fine: the oil binds into the wax instead of sitting exposed to air, and there is no flame at the pouring stage. Keeping fragrance oil away from sparks and open flames is the real safety rule, not keeping the wax below the flash point.
What does affect your candle is fragrance load. Each wax retains only so much fragrance oil. Load up to the manufacturer-recommended maximum for your wax, but never past it. When you exceed that limit, the excess oil separates from the wax instead of binding, and it can bead into small "dew drops" on the candle's surface or pool at the bottom. Those droplets are raw fragrance oil sitting on top of the wax, so they are worth wiping away and avoiding in the first place. Check the recommended load for your wax before you pour: our Fragrance Oils FAQ covers the load numbers, and the soy wax guide and paraffin wax guide list retention by wax.
A second worry we hear is that a high pour temperature will make the fragrance "flash off" and weaken the scent. The oil does not boil away the moment it goes in, but the lightest top notes do degrade when wax sits hot for a long time. Add your fragrance at around 180°F, stir, and pour rather than leaving the scented wax on a melter or burner for an extended period.
Flash Point Across Our Fragrance Oils
Because we test and publish a flash point for every oil, the range across the catalog is easy to see. Among the oils with a published flash point, the values run from about 115°F to above 200°F, with the typical oil near 178°F. The large majority sit comfortably above the thresholds that matter for gel work and shipping.
Flash Point Distribution Across Our Fragrance Oils
| Flash point range | Share of oils | What it affects |
|---|---|---|
| At or above 170°F | About 84% | Clears the threshold most gel manufacturers ask for |
| At or above 140°F | About 96% | Ships as a combustible liquid, the less restricted class |
| Below 140°F | About 4% | Flammable class; tighter shipping limits apply |
By contrast, candle waxes have very high flash points, generally well above 400°F, far above any temperature you reach while pouring. That is why the fragrance oil's flash point, not the wax's, is the number to read. When makers search for a soy wax flash point or a candle wax flash point, the practical answer is that the wax sits far outside your working range.
Gel Candles and Flash Point
Gel candles are the one project where flash point changes which oils you can use. Candle gel runs hotter than wax and holds the fragrance differently, so most gel manufacturers recommend a non-polar fragrance oil with a flash point of at least 170°F. About 84% of our oils clear that bar. An oil with a flash point well below 170°F can ignite more readily in gel, so it is not a safe choice there.
Flash Point and Shipping
Flash point also decides how a fragrance oil can travel, because carriers classify liquids by it. A liquid at or below 140°F is a flammable liquid, and one above 140°F is a combustible liquid, which carriers treat as the less restricted class[1]. The Postal Service prohibits flammable liquids in air transportation and allows combustible liquids by air only under limited-quantity rules, while surface transportation has its own flash-point limits[2]. FedEx also has air transport restrictions for expedited services.
How Flash Point Affects Shipping
| Flash point | Class | What it means for shipping |
|---|---|---|
| Above 140°F | Combustible liquid | The least restricted; ships the widest range of methods |
| At or below 140°F | Flammable liquid | Restricted; USPS air is not available, surface limits apply |
| Below about 100°F | Flammable liquid | Most restricted; only certain surface methods qualify |
In practice this shows up at checkout. When a fragrance oil in your cart has a flash point low enough to fall into a restricted class, the website will not return a USPS rate for it. If every oil in your cart has a high enough flash point and you still see no USPS rate, our Customer Service team can sort it out with you at 1-800-929-9425.
A fragrance oil's flash point is a safety and logistics spec, not a verdict on the oil. Read it the way you read the recommended load: a limit to respect, not a reason to avoid an oil you like. Keep the raw oil away from open flames, stay within your wax's recommended fragrance load, and the flash point takes care of itself.