Katrina Rosales
Adding fragrance to candles is a delicate process, and getting the right amount of fragrance oil is crucial. Too much fragrance oil can overload the wax, causing the wick to struggle, leading to candle tunnelling, poor hot throw, and an inadequate melt pool. To avoid these issues, candle makers typically use 8% fragrance oil, unless the oil is very light. There are two methods for calculating fragrance load: fragrance load, which measures the percentage of fragrance oil in the wax, and fragrance content, which calculates the percentage of fragrance oil in the total weight of wax and oil combined. Using a calculator can simplify the process and ensure accuracy.
Characteristics and Values Table for Working Out Fragrance for Candles
| Characteristics | Values |
|---|---|
| Scent Load | 8% - 10% of candle wax weight |
| Fragrance Oil Weight Calculation | Desired candle weight x % fragrance oil |
| Wax Weight Calculation | Desired candle weight - fragrance oil weight |
| Total Weight | Wax weight + fragrance oil weight |
| Common Issues | Wick struggles, small or no flame, tunnelling, poor hot throw |
| EU Legal Requirement | CLP (Classification, Labelling, and Packaging) |
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What You'll Learn
Calculating fragrance oil percentage
When creating candles, it's important to calculate the correct amount of fragrance oil to ensure optimal performance and avoid issues such as wick clogging and poor hot throw. The fragrance oil percentage, also known as the scent load, can be calculated in two ways: as a percentage of just the wax (fragrance load) or as a percentage of the total weight of wax and oil combined (fragrance content).
Let's start with the fragrance load method. This method calculates the percentage of fragrance oil relative to the weight of the wax. For example, if you have 300 grams of wax and want a 10% scent load, you would calculate 10% of 300 grams, which is 30 grams. So, you would add 30 grams of fragrance oil to 270 grams of wax, resulting in a final product weight of 300 grams. However, as another example, if you add 30 grams of oil to 300 grams of wax, the fragrance oil percentage would be approximately 11.11%, exceeding the recommended scent load for the wax.
On the other hand, the fragrance content method considers the total weight of wax and oil combined. Using this method, you would first calculate the total weight of wax and oil by adding the desired fragrance oil percentage to the weight of the wax. For instance, if you have 200 grams of wax and want a 10% scent load, the total weight would be 220 grams (200 grams of wax + 10% = 20 grams of oil). Next, calculate the fragrance oil by multiplying the total weight by the desired fragrance percentage. In this example, 220 grams multiplied by 10% equals 22 grams of oil. Using this method, you would end up with 22 grams of oil and 198 grams of wax.
It's important to note that the choice between the fragrance load and fragrance content methods depends on personal preference and your production process. Consistency in your calculations and transparency in your labelling or packaging are key. Additionally, you can use online calculators to simplify the process and ensure accuracy in your fragrance oil percentages.
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Scent load ratio
The scent load ratio of a candle is the percentage of fragrance used in candle-making. It determines the scent throw of the candle and the maximum amount of fragrance a candle can hold without causing issues. The fragrance load is always expressed as a percentage and is calculated relative to the amount of wax used.
The fragrance load of a candle depends on the type of wax used. For example, soy wax can hold fragrance better than paraffin. Store-bought candles typically have a fragrance load of 6%, while high-quality, handcrafted candles can have a fragrance load of up to 12%. The fragrance load percentage will impact the candle's performance, with too much fragrance causing issues such as wick clogging, poor hot throw, candle tunnelling, and self-extinguishing.
To calculate the fragrance load, you need to know the weight of the wax you will be using. This can be measured in ounces or grams. Once you have the weight of the wax, you can calculate the fragrance load percentage. For example, if you are using 300g of wax and want a 10% fragrance load, you will need 30g of fragrance oil and 270g of wax. It is important to note that the fragrance load and fragrance content are not interchangeable terms. Fragrance content refers to the proportion of fragrance used in the candle mixture, including the weight of the wax and oil.
There are fragrance load calculators available online that can help simplify the process of calculating the fragrance load. These calculators take into account the number of candles you wish to produce, the container size, the fragrance load percentage, and the wax gravity. By using these calculators, you can ensure that you are using the correct amount of fragrance for your candles and avoid any issues that may arise from using too much or too little fragrance.
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Common issues with overloaded wax
When making candles, it's important to be mindful of the amount of fragrance oil you add to the wax. Overloading the wax with fragrance oil can lead to several issues that can affect the appearance, scent, and burning performance of your candles. Here are some common problems caused by overloaded wax:
Wick Issues: One of the most noticeable issues with overloaded wax is the impact on the wick's performance. The wick may struggle to produce a strong flame or, in some cases, the flame may die out completely. This can result in candle tunnelling, where the wick burns a hole down into the candle, and the melt pool fails to reach the edge. A struggling wick can also cause poor hot throw, as there may not be enough heat generated to release the fragrance from the wax.
Leaking Fragrance Oil: Overloading the wax with fragrance oil can lead to oil seepage or "leaching." This occurs when the wax is unable to hold the excess oil, causing it to leak out of the candle. This may result in an oily surface or liquid forming at the bottom of the container.
Discoloration: Fragrance oils contain various ingredients, both natural and synthetic, that can add an undesirable colour to your candles. For example, natural ingredients like cinnamon and citrus are known to discolour wax. Additionally, vanillin, a common synthetic component found in vanilla fragrance oils, can also contribute to discolouration.
Odd Scent: Using too much fragrance oil can result in an odd or unpleasant scent. This issue is particularly common with certain fragrance notes, such as citrus and mint. Reducing the fragrance oil percentage or adding a small amount of a complementary fragrance oil, like "creamy vanilla," can help alleviate this problem.
To avoid these issues, it's recommended to use a lower percentage of fragrance oil, typically around 8%, unless the oil is very light. Additionally, ensuring proper curing times, maintaining appropriate temperatures when adding fragrance oil, and testing different wick sizes can help optimize the performance of your candles.
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Using a calculator
To make good-quality candles, it's important to be aware of the percentage of fragrance that your chosen wax can hold. This is referred to as the "fragrance load". Using too much fragrance can result in candles with dry or lumpy wax or even produce candles that do not hold a flame.
Several online calculators can help you work out the fragrance load for your candles. These calculators will help you determine how much wax and fragrance or fragrance oil you need to make a certain number of candles of a certain size.
To use these calculators, you will need to enter the number of candles you wish to produce, the container size (in ounces, grams, or pounds), the fragrance load percentage for the wax you are using, and the wax gravity.
For example, let's say you want to make four 8-ounce candles with a 6% fragrance load. You would enter "4" as the quantity, "8 oz" as the container size, "6" as the desired fragrance load percentage, and select the wax type to determine the wax gravity. The calculator will then tell you how much wax and fragrance or fragrance oil you need to use to produce your desired candle size and quantity.
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Labelling and packaging
When it comes to labelling and packaging your candles, there are several important factors to consider. Firstly, the visual appeal of your product is crucial for its marketability. However, it is equally important to ensure that your labels include all the necessary information to comply with relevant regulations and provide transparency to your customers.
In the United States, the Fair Packaging and Labeling Act (FPLA) dictates the information that must be included on a product's outer packaging and main label. This includes a statement identifying the commodity, the name and location of the company, manufacturer, packer, or distributor, and the net weight of the product in both standard and metric measurements. The FPLA also requires the inclusion of safety information, such as warning labels, burning instructions, and any other relevant safety precautions.
In the European Union, the Classification, Labelling and Packaging (CLP) Regulation ((EC) No 1272/2008) is the relevant legislation. This regulation is based on the United Nations' Globally Harmonised System (GHS) and aims to protect health and the environment, as well as facilitate the movement of substances and mixtures. The CLP sets detailed criteria for labelling elements, including pictograms, signal words, and standard statements regarding hazards, prevention, response, storage, and disposal. It also includes general packaging standards to ensure the safe supply of hazardous substances and mixtures.
To ensure compliance with these regulations, it is essential to provide full transparency on the fragrance load or fragrance content of your candles. This involves calculating the percentage of fragrance oil relative to the wax or the total weight of wax and oil combined. Consistency and clarity in these calculations are crucial, especially for labelling purposes. By following these guidelines and providing detailed information on your labels, you can ensure legal compliance, enhance consumer trust, and provide your customers with all the necessary details to make informed purchases.
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Frequently asked questions
You can calculate the fragrance oil needed either as a percentage of the wax (fragrance load) or the total weight of wax and oil combined (fragrance content). For example, if you have 300g of wax and want a 10% fragrance load, you will need 30g of fragrance oil and 270g of wax.
Fragrance content is the total weight of wax and oil combined. For example, if you start with 200g of wax and want a 10% fragrance content, you will need 20g of oil. This method results in 22g of oil and 198g of wax.
A high fragrance oil percentage may be causing common issues such as a struggling wick, tunnelling, or poor hot throw. Try lowering the fragrance oil percentage to 8% to improve performance.
You can use an online calculator to work out the fragrance load and content for a batch of candles. You will need to input the desired candle weight, the percentage of fragrance oil, and the candle quantity.
