Seamus Hammond
Flash point is a term used to describe the temperature at which a fragrance oil's vapours can be ignited by an open flame. This is important to note when making candles, as the flash point can affect the longevity of the fragrance. Candle makers must also be aware of the regulations surrounding the transportation of fragrance oils, as those with low flash points cannot be delivered by air due to their potential to ignite.
| Characteristics | Values |
|---|---|
| Definition | Flash point is the temperature at which vapour from the oil may ignite if exposed to an open flame or spark |
| Applicability | Flash points apply to all fluids, including fragrance oils |
| Flammability | Fragrance oils are flammable and can be ignited under certain conditions |
| Transportation | Liquids with a low flash point cannot be transported by air due to safety regulations |
| Shipping Regulations | Shipping carriers have specific flash point requirements for safe shipping, e.g., FedEx (100°F or higher), USPS (140°F or higher) |
| Candle Making | Adding fragrance oil to wax above the oil's flash point can degrade the fragrance and weaken the scent throw |
| Storage | Flammable fragrance oils have specific storage requirements to prevent fire and explosion risks |
| Volatility | Lower flash points result in higher volatility, causing the fragrance oil to turn into vapour and be lost quicker |
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What You'll Learn
Flash point and transportation
Flash points are often misunderstood, even by experienced candle makers. A fragrance oil's flash point refers to the temperature at which vapour from the oil may ignite when exposed to an open flame or spark. This is also known as the combustion or ignition point.
The flash point is important for understanding the volatility of a fragrance oil. The lower the flash point, the more volatile the oil is, meaning it will turn to vapour quicker and be lost faster. This is an important consideration if you want your fragrance to last, especially when using it in candles. If the flash point is too low, the fragrance could evaporate very quickly, meaning the scent will be strong initially but will not last long.
When making candles, it is crucial to select oils with a flashpoint higher than the maximum temperature reached during the candle's burning process. This ensures that the fragrance oil remains stable and does not contribute to the risk of flammability. Understanding flash points helps prevent potential safety issues.
In terms of transportation, the flash point is a legal term used to identify which substances can be safely transported on an airplane. Some regulatory bodies and shipping guidelines impose restrictions on flammable substances based on their flash point. For example, under the law, flammable liquids (including fragrance oils) with a flash point at or below 141° F (60.5° C) cannot be transported by air due to their potential to ignite. This regulation is in place out of an abundance of caution, as it is very unlikely for a flammable liquid to be exposed to a source of ignition during air transportation.
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Flash point and candle-making
Flash points are often misunderstood, even by experienced candle makers. This is partly because the term is commonly used in the fragrance oil industry, but it is also a legal term. In the simplest terms, a fragrance oil's flash point is the temperature at which the vapour from the oil may ignite when exposed to an open flame or spark.
The flashpoint is critical in the candle-making process. If you're adding fragrance to a heated product, it's important to ensure that you don't add it to a base at a temperature that exceeds its flashpoint. When that happens, you can burn off some of the lower-weight molecules in your fragrance oil, changing the balance of your top, mid, and base notes. For both safety and performance, it's always important to know your fragrance flashpoint and to make sure that you never heat your fragrance beyond that temperature.
The flashpoint is also important when ordering fragrance oils online. Under the law, flammable liquids (including fragrance oils) with a flash point at or below 141°F (60.5°C) cannot be transported by air due to their potential to ignite. This is very important for candle makers to know, as it affects how their supplies are shipped.
It's worth noting that simply warming a fragrance oil to its flash point doesn't create mass evaporation of its notes. If the fragrance is raised to its boiling point, then mass evaporation would occur, and a lot of scent would leave the fluid. However, this only applies to the fragrance oil by itself. In candle-making, fragrance oil is added to hot wax, creating a mixture. Since wax typically makes up about 90% of blends, the properties will be closer to those of wax than fragrance oil.
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Flash point and scent
Flash point is a term used to describe the temperature at which a fragrance oil's vapours can be ignited by an open flame or spark. This is also known as the combustion or ignition point. It is important to understand flash points for safety reasons, particularly when dealing with flammable liquids such as fragrance oils.
The flash point of a fragrance oil is important to understand when making candles. If the oil is heated to its flash point and then exposed to a flame or spark, it will ignite. However, this is unlikely to occur during the normal process of making candles, as the amount of fragrance oil used is relatively small. For example, a candle with a 10% fragrance oil-to-wax ratio will not reach its flash point.
The flash point of a fragrance oil also determines how quickly the scent will evaporate. A lower flash point means the oil will turn to vapour more quickly and the scent will be lost faster. This is an important consideration when making candles, as you want the fragrance to last. If the flash point is too low, the fragrance may evaporate before the candle has completely burned down. Therefore, fragrance oils with higher flash points are generally recommended for candle-making.
Additionally, the flash point of a fragrance oil can impact its shipping and storage. Due to the risk of fire and explosion, different regulations apply to flammable materials. Fragrance oils with low flash points cannot be transported by air, and some carriers have specific minimum flash point requirements for shipping. It is also important to store flammable fragrance oils safely, taking into account their potential volatility.
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Flash point and safety
Flash points are often misunderstood, even by experienced candle makers. A fragrance oil's flash point refers to the minimum temperature at which vapours from the oil may ignite when exposed to an open flame or spark. This is only possible if there is a large volume of oil in an enclosed space.
The flash point is critical in the fragrance-making process. When adding fragrance to a heated product, such as soap or candles, it is important to ensure that the fragrance is added at a temperature below its flash point. Adding fragrance beyond this point can burn off some of the lower-weight molecules in the oil, altering the balance of the top, mid, and base notes, and changing the chemical composition of the fragrance. This is important for both safety and performance.
The flash point is also important for determining shipping methods. For safety reasons, liquids with a flash point at or below 141° F (60.5° C) cannot be transported by air due to their potential to ignite. This includes fragrance oils.
The flash point of a fragrance oil can be found on the label of the bottle or on the product page. Most fragrance oils have a flash point between 141° and 200° F (60.5° and 93° C), or higher. It is important to note that fragrance oils are flammable and can be ignited under certain circumstances. However, the normal process of making candles would never put you in such a situation.
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Flash point and storage
Flash points are often misunderstood, even by experienced candle makers. A fragrance oil's flash point refers to the temperature at which the vapour from the oil may ignite when exposed to an open flame or spark. This does not mean that heating fragrance oils to their flash point will cause mass evaporation of the scent. Instead, mass evaporation occurs when the fragrance is raised to its boiling point.
Flash points are important to understand for storage, handling, and shipping purposes, as the regulations for flammable materials are different from those for non-flammable materials due to the risk of fire and explosion. Fragrance oils with a flash point at or below 141°F (60.5°C) are considered flammable and cannot be transported by air.
When storing fragrance oils, it is important to keep them in dark areas to prevent damage from light exposure. Additionally, each component within a fragrance oil has its own flash point, which affects the final flash point of the oil, so it is crucial to refer to the safety data sheet (SDS) for each oil to understand its specific storage requirements.
It is worth noting that adding fragrance oil to wax heated above the oil's flash point will not affect how strong your candle smells. However, heating and cooling fragranced wax repeatedly can impact the scent's strength.
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Frequently asked questions
A fragrance oil's flash point is the minimum temperature at which the oil turns to vapour and can be ignited.
The flash point is important for transportation and storage. Liquids with a low flash point cannot be transported by air due to their potential to ignite. The flash point also determines the longevity of the fragrance when burnt.
A flash point of 170°F or higher is recommended for fragrance oils used in gel candles. For shipping through USPS, fragrance oils must have a flash point of 140°F or higher.
