Lance Carson
When making gel candles, it's important to select the right fragrance to ensure safety and a pleasant scent. The density of the gel wax and the type of fragrance used will determine the concentration of the scent. Non-polar fragrances with a flashpoint above 170°F are recommended to prevent the fragrance from migrating out of the gel. The size of the wick also affects the scent throw, and it's crucial to choose a wick designed for gel candles to accommodate their higher burning temperature. To optimize scent throw and stability, the fragrance concentration in the candle mixture should be between 6% and 10%. It is also suggested to make a small test candle to ensure the desired scent and safety.
Characteristics and Values of Fragrances for Gel Candles
| Characteristics | Values |
|---|---|
| Type of fragrance | Non-polar |
| Flashpoint | Above 170°F |
| Concentration of scent | Low density = 0-3% |
| Medium density = 0-4% | |
| High density = 0-5% | |
| Dye | Liquid |
| Wick | Designed for gel candles |
| Fragrance oil | Should be mixed thoroughly into melted wax |
| Should not be burned if it starts to separate | |
| Should be added to wax when it is 150°F or below |
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What You'll Learn
Fragrance oil flashpoints and how they affect gel candles
The flashpoint of a fragrance oil is the temperature at which vapors from the oil may ignite when exposed to an open flame. Flashpoints are important to understand when making gel candles, as they can affect the safety, scent, and overall burn performance of your creations.
Firstly, the flashpoint of a fragrance oil is important for safety reasons. While fragrance oils are flammable, the normal process of making candles would never put you in a situation where the oil would combust. This is because, for a flammable liquid like fragrance oil to combust at its flashpoint, there needs to be a large volume of oil in an enclosed vessel. However, if your fragrance oil starts to separate, do not burn the candle, as you don't know how the oil will behave when introduced to a direct flame.
Secondly, the flashpoint of a fragrance oil can affect the scent retention in a finished candle. If the wax you are adding fragrance to is hotter than its flashpoint, the fragrance's volatile top notes can evaporate, leaving a weaker scent. Fragrance oils with higher flashpoints tend to have better scent retention as they evaporate more slowly during burning, gradually releasing the fragrance.
Thirdly, the flashpoint can influence the overall burn performance of the candle. Fragrance oils with higher flashpoints typically produce a more stable burn with less smoking and sooting.
When making gel candles, it is recommended to use a non-polar fragrance oil with a flashpoint higher than 170°F. This is because gel wax has different properties to other types of wax, and using a fragrance oil with a lower flashpoint may cause the fragrance to migrate out of the gel and cause problems.
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Choosing the right wick for your gel candle
Firstly, you need to choose a wax type. Popular types include soy, paraffin, palm, coconut, and gel wax, each with its pros and cons depending on the candle type and wick style. For gel candles, a blend of cotton and braided paper fibres is often used to create a rigid and robust wick. Alternatively, you can use a flat braid style, which offers greater flexibility as they are zinc-free and allow makers to choose from a wide variety of waxes.
Next, you need to select a wick. Some wicks work better with certain waxes than others. Burn behaviour can be affected by the container, dye, and fragrance oil, so even if a wick is suitable for a particular wax, these factors may impact its performance. For example, coreless, cotton braided wicks with paper filaments are designed to bend at the tip when burning, forcing the tip of the wick into the outermost flame where it burns hottest, resulting in more complete combustion and less smoke.
Then, you need to measure the diameter of your container, which will help you determine whether to use one or more wicks. Container candles that are larger than 3 inches tend to work better with multiple wicks. You can refer to sizing charts to match the burn diameter of your wick to the diameter of your container.
Finally, you need to test your candle. A burn test is the best way to determine if you have chosen the right wick. You should burn a minimum of three candles for four hours at a time to ensure consistency and safety. If the candle has an acceptable scent throw, with most of the wax consumed, and no soot, tunnelling, or excessive heat, then the wick is the right size. If not, you should try a new wick and candle to see if it produces better results.
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How to select the right gel wax density for your desired scent concentration
When creating gel candles, it's important to select the right gel wax density to achieve your desired scent concentration. The density of gel wax determines the amount of fragrance that can be held within the candle, and different densities are better suited for different purposes. Here's a guide to help you select the right gel wax density:
If you're aiming for a strong fragrance release, opt for a high-density gel wax. This type of wax can hold a higher percentage of fragrance, ranging from 0% to 5%. It is ideal for creating candles with a powerful scent throw. High-density gel wax is perfect for larger spaces or if you prefer a more intense fragrance experience. This option is suitable for those who want their candles to quickly fill a room with their chosen scent.
On the other hand, if longevity is your priority, low-density gel wax is the way to go. With a fragrance capacity of 0% to 3%, these candles may have a more subtle scent, but they will burn for a longer period. Low-density gel wax is perfect for creating a gentle, lasting aroma in your space. Consider this option if you want your candles to provide a more subtle and continuous fragrance over an extended period.
For those seeking a balance between fragrance strength and longevity, medium-density gel wax is the ideal choice. This type of wax can hold between 0% and 4% fragrance, providing a good middle ground in terms of scent concentration. Medium-density gel wax is versatile and suitable for most candle applications. It will deliver a pleasant fragrance without being overpowering, and it will also burn for a decent duration.
When selecting your gel wax density, it's important to keep in mind that not all fragrance oils are compatible with gel wax. Choose fragrances with a flashpoint above 77 degrees Celsius or 170 degrees Fahrenheit to ensure safety and stability. Additionally, always follow the recommended temperature guidelines when adding your fragrance to the gel wax to avoid any issues with solubility and to ensure the fragrance blends well.
Lastly, don't be afraid to experiment with different combinations of wax densities and fragrances. Creating gel candles is a fun and creative process, and you might discover unique pairings that work perfectly for your desired outcome.
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Using liquid dyes to colour your gel candle
When making gel candles, it's important to use liquid dyes, as most other dyes are wax-based and can cause the gel to become cloudy. Luckily, liquid dyes are extremely versatile and can be used with gel wax, as well as soy wax, coconut wax, paraffin wax, beeswax, and natural wax blends.
Liquid dyes are highly concentrated, so only a small amount is needed to colour your gel candle. They are also easy to use, requiring only a few drops to be added to your melted wax and stirred gently to achieve an even colour. The amount of dye you use will depend on the desired shade and the amount of wax you are using. As a reference, 1 oz. of dye will bring 100 lbs. of wax to a medium shade of colour.
When choosing a liquid dye, opt for one that is paraben-free and phthalate-free. Additionally, some candle dyes have a strong chemical smell, so choose a dye with a mild odour that won't interfere with your candle's fragrance. It's also important to select a dye that is virtually free from insoluble materials, as you don't want specks of debris or colourant to be noticeable in your gel candle.
To add the liquid dye to your gel candle, start by melting your wax in a double boiler or electric wax melting pot. Ensure that the wax is fully melted and that there are no pieces of hard wax left. Then, use a pipette or dropper to dispense the dye into the melted wax. Gently stir the mixture until you achieve an even colour. Remember, liquid dyes mix easily and require minimal stirring, which helps prevent the formation of particles or sediment.
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The best types of fragrance oils for gel candles
When it comes to choosing the best fragrance oils for gel candles, there are a few key factors to consider. Firstly, it is important to select a fragrance oil that is specifically designed for use with gel candles. These oils have unique properties that ensure they are compatible with the gel wax and provide the best scent throw.
The type of gel wax you use will determine the concentration of scent you can achieve. Low-density gel wax can hold between 0-3% scent, medium-density gel wax can hold between 0-4% scent, and high-density gel wax can hold between 0-5% scent. It is important to choose a fragrance oil that falls within the appropriate concentration range for your chosen gel wax.
Another important factor to consider is the flashpoint of the fragrance oil. Gel candles require the use of non-polar fragrance oils with a high flashpoint, typically above 170° F. This is because fragrance oils with a low flashpoint may burn off when added to hot wax, and they can also migrate out of the gel and cause problems.
It is also recommended to select a fragrance oil that is phthalate-free and adheres to safety standards such as RIFM and IFRA. This ensures that your gel candles are not only fragrant but also safe to burn.
Finally, when adding fragrance oil to your gel candle, always follow the directions for the specific products you are using. Fragrance oils should typically be added to the wax once it has cooled to below 150° F, and it is important to thoroughly mix the oil into the wax to prevent separation. By following these guidelines, you can create beautiful, safe, and fragrant gel candles.
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Frequently asked questions
You can use fragrance oils for gel candles. Choose a non-polar fragrance with a flashpoint higher than 170°F.
The flashpoint is the temperature at which the fragrance oil becomes combustible if exposed to a spark or flame. The lower the flashpoint, the faster it can catch on fire.
The amount of fragrance oil you can use depends on the density of the gel wax. Low-density gel wax can hold between 0-3% fragrance, medium-density gel wax can hold between 0-4% fragrance, and high-density gel wax can hold between 0-5% fragrance.
Yes, you can use soap fragrance oils in gel candles, but they may not have been tested for scent throw. The scent may change once the candle is burned or may not give off the best scent throw.
In addition to the fragrance, you will need to choose a glass container, such as a mason jar or drinking glass, and select the proper wick and sustainer base for the pre-wick assembly. You can also add wax inserts and colour with liquid candle dye.
