This is Why Your Soy Wax Candles Crack: Troubleshooting Guide

Have you ever lit a soy wax candle only to see it crack and ruin the aesthetic of your cozy ambiance? It can be frustrating, especially when you’ve invested time and money into creating the perfect atmosphere. But don’t worry, you’re not alone. Soy wax candles are notorious for cracking, and possible causes could be due to the type of wax used or the scents added. However, if you want to avoid this issue altogether, consider using beeswax instead.

There are various possible causes why soy wax candles crack, but the main culprit is the cooling process. When soy wax cools too quickly or unevenly, it can cause unsightly cracks on the surface of your candle. Using the wrong type of wax or wick size can also contribute to candle cracking. Additionally, using beeswax as a blend with soy wax can help prevent cracking while adding a natural touch to your candles. Adding fragrance oil or scents can also affect the cooling process and potentially lead to cracking, so it’s important to use the appropriate amount for your candle size.

Understanding these reasons behind soy wax candle cracking is crucial in preventing cracked candles from happening in the future, especially for homemade candles. It’s important to ensure that finished candles, whether scented candles or unscented ones, are free from cracks to ensure their quality and longevity.

So if you’re tired of dealing with cracks in your candles and want to create a flawless ambiance every time, keep reading to learn more about why your soy wax candles may be cracking. Whether you’re using fragrance oils or scents, it’s important to understand how they can affect the quality of your candles. And don’t forget about the type of glass you use, as it can also play a role in candle cracking.

Understanding Soy Wax and Its Properties

What is Soy Wax?

Soy wax is a natural wax made from soybean oil, which is a renewable resource. It has become popular in recent years due to its eco-friendliness as well as its ability to hold fragrance and burn cleanly. Soy wax candles are also known for their longer burn time compared to other types of candles. The wood wick creates a warm flame that crackles softly, while the spice aroma fills the room with a cozy scent.

Why Does Soy Wax Crack?

While soy wax has many benefits, it also has some unique properties that can lead to cracked candles. One reason for this is the lower melting point of soy wax compared to other waxes, which makes it more prone to cracks when exposed to temperature changes or if poured at too high of a temperature. It’s important to note that using the right candle wick for your homemade candles can also help prevent cracks.

Another factor that can contribute to cracking in soy wax is the presence of vanillin, a common ingredient used in scented candles fragrances. When vanillin is present in high amounts, it can cause the finished candles to discolor and crack over time, especially for wood wick candles and herbal candles.

Finally, mushroom-like crystals can form on the surface of soy wax candles as they cool. These crystals are harmless but can create an uneven surface that may lead to cracking. Possible causes of cracks include the use of too much fragrance oil or vanillin in the candle-making process.

How Can You Prevent Cracking in Soy Wax Candles?

There are several steps you can take to prevent your soy wax candles from cracking. To avoid cracks, it is important to take care of your candles properly. One possible solution is to add fragrance oils at the right temperature and ratio, as adding too much or too little can cause cracks. Another solution is to avoid exposing your candles to extreme temperatures, as this can also lead to cracks. Lastly, proper care such as trimming the wick and keeping the candle away from drafts can also help prevent cracks from forming.

  1. Pour at the Right Temperature: To avoid cracking due to pouring at too high of a temperature, make sure you pour your melted soy wax for candle making between 120-135°F (49-57°C). This is essential for ensuring the proper care of your candle wick and preventing any damage to your finished candles.
  2. Use Fragrance Oils with Caution: While fragrance oils add aroma and character to your soy wax candles, they can also cause problems like discoloration and cracks in the molten wax if not used properly. Make sure you choose high-quality fragrance oils that are specifically designed for use in soy waxes.
  3. Add Additives: Adding certain additives like stearic acid or beeswax can help improve the structural integrity of your soy wax candles and reduce the likelihood of cracks. To enhance the aroma, consider adding fragrance oils. Don’t forget to take care of your candles by trimming the wick before each use.
  4. Store with care: To help prevent cracks and preserve fragrance, store your soy wax candles in a cool, dry place away from direct sunlight.
  5. Use High-Quality Soy Wax: Not all soy waxes are created equal. Make sure you choose a high-quality natural soy wax that is specifically designed for scented candles and wood wick candles to ensure the best results. The candles crack when using low-quality wax, so it’s important to invest in a good quality wax. Additionally, the fragrance of your candle will be more prominent with high-quality soy wax.

Choosing the Right Containers and Wicks

Match Your Wick to Your Container Size

Choosing the right container for your soy wax candle is only half the battle. The wick you choose to use in that container is just as important, as it can help prevent cracks in your candle. If you’re experiencing cracks in your soy wax candles, it could be due to using the wrong size or type of wick for your container. Additionally, taking care to properly fragrance your candle and practicing proper care can also help prevent cracking. If you need further assistance, don’t hesitate to seek help from a professional.

When selecting a wick for your candle making, consider the diameter of your container. A larger diameter will require a thicker wick, while a smaller diameter will need a thinner one. It’s essential to match the wick size to the container size to ensure proper burning and candle care. This is especially important when making herbal candles or scented candles.

If you’re unsure which size wick to use for your scented or herbal candles during candle making, perform a test burn with different sizes until you find the perfect match. Candle care is crucial to ensure that your candles burn safely and evenly. You can also consult with your supplier or refer to online resources for guidance on candle making and choosing the right wick size.

Follow Directions for Scent Oils and Fragrances

Scent oils and fragrances are an essential part of making soy wax candles, but using too much or too little can cause issues like uneven burning and cracks. Careful use of these oils can help prevent these cracks and ensure the longevity of your candles.

It’s crucial to follow directions when adding scent oils or fragrances to scented candles or wood wick candles to ensure optimal scent throw without compromising the integrity of your candle. Typically, 1 oz of fragrance oil per pound of soy wax is sufficient, but always check with your supplier for specific recommendations to help prevent cracks.

Overloading on fragrance scents can lead to excess fuel consumption and heat buildup, which can cause cracks in your candles. Don’t be tempted to add more than recommended; trust that less is more. Excess heat can also result in molten wax leaking out of the wax mixture, so it’s important to follow the recommended guidelines for a safe and successful candle-making experience.

Burn at the Right Temperature

Burning soy wax candles at too high of a temperature can cause smoke and soot buildup on containers, leading them to crack over time. To prevent this from happening and help extend the life of your candles, make sure you’re burning them at the correct temperature. Additionally, choosing a high-quality fragrance can also help reduce the risk of cracks.

The ideal temperature range for burning soy wax candles with fragrance is between 65-80 degrees Fahrenheit (18-27 Celsius). If the temperature is too high, it may cause cracks in the candle. Monitoring the temperature with a thermometer can help prevent this.

Make sure you’re trimming your wick to ¼ inch before each burn for proper candle care. A longer wick can cause excessive heat buildup and lead to cracking, which can affect the quality of your handmade candle making. This is especially important for herbal candles and scented candles, as they require extra attention to maintain their fragrant aroma.

Use the Right Wick Size

Candle making requires careful candle care to avoid cracks in scented candles. Using too much fuel can cause excessive heat and lead to cracking, so it’s important to choose the right wick size for your container. A wick that is too small will not create enough heat to melt the wax evenly, while a wick that is too large will produce too much heat and cause cracking.

When selecting a wick size for your scented candles, consider the diameter of your container as well as the type of wax you’re using in your candle making. Proper candle care involves choosing the right wick to ensure that your fragrance burns evenly and cleanly. Soy wax typically requires a larger wick than other types of wax due to its lower melting point, which can affect the release of fragrance.

Performing test burns with different sizes and types of wicks can help you determine which one is best for your candles. Remember that choosing the right wick size is crucial for achieving even burning and preventing cracking in soy wax candles. Additionally, testing with various fragrances can also assist you in finding the perfect match for your candle.

Proper Pouring Techniques to Prevent Cracking

If you’re a candle maker, you may have experienced the frustration of your soy wax candles cracking. Not only is it unsightly, but it can also affect the overall quality and burn time of your candle. Fortunately, there are steps you can take to prevent this from happening, including adding fragrance to your candle.

1. Check Your Pouring Temperature

One of the most critical factors in candle making and candle care to prevent cracking is ensuring that your pouring temperature is correct. Soy wax, commonly used in scented candles and wood wick candles, has a lower melting point than other waxes, which means it’s essential to pour at a lower temperature. If the wax is too hot when poured into the container, it can cause cracking or even melt the container.

To prevent this from happening while making scented candles, check your manufacturer’s guidelines for recommended pouring temperatures for their specific soy wax product. Typically, pouring temperatures range between 110°F and 135°F (43°C -57°C), depending on the type of soy wax used in candle making.

2. Pour on a Solid Surface

Another way to prevent cracks and wet spots when making scented candles or soy candles is by pouring the molten wax on a solid surface such as a countertop or table instead of directly onto an uneven surface like carpet or cloth.

Pouring molten wax on an uneven surface could cause movement during cooling and lead to uneven distribution of heat across the surface area of scented soy candles, which may result in cracks or wet spots.

3. Achieve a Full Melt Pool

A full melt pool refers to when melted wax from candle making reaches all edges of the container while burning evenly without tunneling or creating holes in the center. This is especially important for scented candles, particularly soy candles, as it ensures a consistent and long-lasting fragrance experience.

It occurs when you let your scented candle burn long enough for all its entire top layer to liquefy before extinguishing it; this ensures that subsequent burns of scented candles will be even throughout without causing any damage due to uneven heating patterns.

To achieve this effect with scented candles, ensure that you allow your candle to burn for at least two hours before extinguishing it. This process will ensure that the wax melts evenly and does not cause any cracks or wet spots.

4. Avoid Water and Moisture

Water and moisture are enemies of soy wax candles as they can cause frosting, surface imperfections, and even lead to cracking.

To prevent this from happening, ensure that all equipment used in making candles is dry before use. Also, avoid pouring wax into containers that have water or moisture droplets on the surface.

5. Follow Safety Guidelines

When handling hot wax for candle making, safety should be a top priority. Ensure you follow all safety guidelines provided by the manufacturer or regulatory bodies such as OSHA (Occupational Safety and Health Administration) when making scented candles or soy candles.

Some of these guidelines for candle making include wearing protective gear like gloves and goggles when handling hot wax, ensuring adequate ventilation in your workspace, using a thermometer to monitor temperatures accurately, and keeping a fire extinguisher nearby in case of emergencies. For scented candles, it’s important to follow these guidelines to ensure safety during the candle making process.

Possible Solutions to Cracking Soy Wax Candles

If you’ve experienced cracking despite following proper pouring techniques, here are some possible solutions for scented candles.

  • Mix additives: Adding Vybar or stearic acid can help strengthen the scented candles’ structure.
  • Adjust Pouring Temperature: Try adjusting your pouring temperature up or down slightly to find the optimal temperature for your specific soy wax product.
  • Use Different Containers: If you’re experiencing cracking with a particular container type, try switching to another type of container.
  • Check Flash Point: Ensure that your fragrance oil has an appropriate flashpoint for soy wax candles; if it’s too low, it could cause issues with cracking.

Preheating and Cleaning Containers Before Pouring

Preheating Clear Containers Before Pouring

One of the reasons why your soy wax candles are cracking is that you might be pouring hot wax into a cold container. This sudden temperature change can cause the wax to contract and crack as it cools. To avoid this issue, preheat your clear containers before pouring. You can do this by placing them in a warm oven or using a heat gun to warm them up. Be sure not to use high temperatures as this can also cause cracking.

Cleaning Containers to Remove Any Dust or Debris

Another thing that can contribute to cracking is dust or debris inside your containers. Before pouring, make sure that your jars are clean and free from any particles that may have settled inside. Use a soft cloth or paper towel to wipe down the inside of each jar, removing any dirt, dust, or debris.

Maintaining Pour Temperature to Avoid Cracking

It’s essential to maintain the pour temperature when making soy wax candles. If the temperature is too low, the wax will not melt correctly and may not adhere well to the jar’s sides. On the other hand, if it’s too high, it can cause cracks in your candle as it cools down. Make sure you follow the manufacturer’s instructions for melting soy wax and maintaining an appropriate pour temperature.

Stirring Mixture to Ensure Even Melting and Cooling

Stirring your mixture while melting ensures even heating throughout all ingredients in your mixtures which helps prevent separation of oils from waxes during cooling resulting in uneven burn pools later on after lighting up candles made from such mixtures which will ultimately lead to cracking due to uneven cooling.

Enough Heat During Manufacturing Process

Make sure you have enough heat during manufacturing process so that all ingredients melt properly without leaving any unmelted chunks behind which could result in uneven burning of candles causing cracks over time due to uneven melting and cooling.

Keeping Work Surface Clean and Safe

It’s important to keep your work surface clean and safe when making soy wax candles. Wax can be messy, so make sure you have a clean workspace before starting. Use a protective covering on your work surface to prevent any spills or drips from damaging it. Also, ensure that you are working in a well-ventilated area and have all necessary safety equipment like gloves, goggles, etc., at hand.

Checking the Melt Pool Size

When burning soy wax candles, it’s essential to check the melt pool size. If the melt pool is too small, it means that the candle isn’t burning correctly, which can cause cracking over time. To avoid this issue, make sure that the wick is appropriately sized for your container and follow proper burning instructions.

Monitoring Wax for Air Bubbles and Tapping Containers to Release Them

Small Air Bubbles Can Form in the Wax as It Cools

Have you ever noticed tiny air bubbles on the surface of your soy wax candles? These small air bubbles can form in the wax as it cools. While they may seem insignificant, they can cause spots on the surface of the candle, which can be unsightly and affect its overall appearance. To prevent this from happening, it’s essential to monitor the wax for air bubble formation during cooling.

One way to do this is by pouring the wax at a lower temperature. When you pour hot wax into a container, air bubbles can get trapped inside. Pouring at a lower temperature allows the wax to cool more slowly and gives any trapped air bubbles time to rise to the surface before solidifying.

Another method is to stir the wax gently while it’s cooling. This helps release any pockets of air that may have formed during pouring or mixing. Be careful not to over-stir, though, as this can create even more air bubbles.

Tapping the Container Can Help Release Any Additional Air That May Be Trapped

Even with these precautions, some small air bubbles may still remain in your candle. If you notice them after pouring and while the candle is still warm, tapping the container gently on a hard surface can help release any additional air that may be trapped.

This technique works by causing vibrations that encourage any remaining air pockets to rise to the top of the liquid wax where they will pop and disappear. Be sure not to tap too hard or too often as this could damage your container or cause more problems than it solves.

Humidity Can Also Affect The Performance Of The Wax And Lead To Air Bubble Formation

In addition to monitoring for air bubble formation during cooling and tapping containers when necessary, humidity levels must also be considered when making soy wax candles. High humidity levels can affect the performance of the wax and lead to air bubble formation.

When humidity levels are high, excess moisture in the air can be absorbed by the wax, causing it to become softer and more pliable. This increased softness makes it easier for air bubbles to form during cooling. To combat this issue, try using a dehumidifier when making candles or avoid making candles on particularly humid days.

Troubleshooting Common Issues in Soy Wax Candle-Making

Possible Causes of Common Soy Candle Wax Problems

Soy wax candles are a popular choice among candle enthusiasts because they burn cleaner and longer than paraffin wax candles. However, some candle-makers may experience issues with their soy wax candles cracking or frosting. The possible causes of these problems include:

  • Pouring the wax at too high a temperature
  • Using a wick that is too small for the container
  • Adding fragrance oil at too high a temperature
  • Not allowing the candle to cure long enough before burning

To prevent these common occurrences, it’s important to follow proper candle-making techniques and use quality materials.

Troubleshooting Issues with Molten Wax and Wax Melts

Candle-makers may also experience issues when working with molten wax or creating wax melts. Some common issues include:

  • Uneven melting of the wax
  • Difficulty removing the hardened wax from molds
  • Poor scent throw in the finished product

To address these issues, consider adjusting your technique by using a double boiler or heat gun to melt the wax evenly. Using silicone molds can make it easier to remove hardened wax without damaging your product.

Try experimenting with different types and amounts of fragrance oils until you find what works best for you.

Addressing Imperfections and Soot in Candle Burns

Another issue that may arise when making soy wax candles is imperfections in the finished product or soot buildup during burns. These can be caused by factors such as:

  • Air bubbles forming during pouring
  • Inadequate wick trimming before lighting
  • Burning the candle for too long at one time

To fix these issues, try using a heat gun to eliminate air bubbles before pouring your melted soy wax into containers. Trim your wick to 1/4 inch before each burn and avoid burning your candle for more than four hours at a time to prevent soot buildup.

Trying to Use Leftover Wax to Fix Common Occurrences

If you have leftover wax from your candle-making projects, consider repurposing it to fix common occurrences. For example, if you experience frosting on your candles, try melting down the leftover wax and pouring it over the top of the candle to create a smooth finish. You can also use leftover wax to create wax melts or add color and fragrance to new batches of candles.

Tips for Successful Soy Wax Candle-Making

Making soy wax candles can be a fun and rewarding experience, but it can also be frustrating when your candles start to crack. To help you avoid this issue, we’ve compiled some tips for successful soy wax candle-making.

Understanding Soy Wax and Its Properties

Soy wax is a natural alternative to paraffin wax and is made from soybean oil. It has a lower melting point than paraffin wax, which means it burns slower and cooler. Soy wax also has a unique texture that can make it more challenging to work with than other types of wax.

Choosing the Right Containers and Wicks

When making soy wax candles, it’s important to choose the right containers and wicks. The container should be heat-resistant and able to withstand the temperature of the melted wax. The wick should also be appropriate for the size of the container to ensure an even burn.

Proper Pouring Techniques to Prevent Cracking

One of the main reasons why soy wax candles crack is due to improper pouring techniques. To prevent this from happening, pour the melted wax slowly into the center of the container while keeping the wick straight. Avoid pouring too quickly or moving the container around too much.

Preheating and Cleaning Containers Before Pouring

Preheating your containers before pouring can help reduce cracking in your soy wax candles. Place your containers in an oven set at 170 degrees Fahrenheit for about 10 minutes before pouring in the melted wax. Also, make sure your containers are clean and free from any debris that could cause imperfections in your finished candle.

Monitoring Wax for Air Bubbles and Tapping Containers to Release Them

Air bubbles can form in your melted wax as you pour it into your container, which can lead to cracking once it cools down. To prevent this from happening, monitor your melted wax for air bubbles by tapping on the side of the container to release them.

Troubleshooting Common Issues in Soy Wax Candle-Making

Even with proper techniques, issues can still arise when making soy wax candles. Some common problems include frosting, sinkholes, and uneven burning. If you encounter any of these issues, don’t worry! There are solutions available to help troubleshoot and fix these problems.

In conclusion, making soy wax candles can be a fun and rewarding hobby as long as you follow the right steps and techniques. By understanding soy wax properties, choosing the right containers and wicks, using proper pouring techniques, preheating and cleaning containers before pouring, monitoring for air bubbles and tapping containers to release them, and troubleshooting common issues that may arise during candle-making process you can avoid cracking in your soy wax candles.

So why not give it a try? With these tips in mind, you’ll be well on your way to creating beautiful and fragrant soy wax candles that will bring joy to yourself or others!


Q: What is the best temperature for melting soy wax?

A: The ideal temperature for melting soy wax is between 170-180 degrees Fahrenheit.

Q: How do I choose the right wick size for my container?

A: The size of your wick depends on the diameter of your container. You can use online calculators or consult with a professional candle-making supplier to determine the appropriate wick size.

Q: Can I reuse leftover melted wax from previous candle-making sessions?

A: Yes! You can melt down leftover wax from previous candle-making sessions as long as it’s clean and free from debris.

Q: How long should I let my candles cure before burning them?

A: It’s recommended to let your candles cure for at least 24 hours before burning them to ensure they have fully set.

Q: Can I add fragrance oils or essential oils directly into melted soy wax?

A: Yes, you can add fragrance oils or essential oils directly into melted soy wax. However, it’s important to follow the recommended usage rates for each oil to avoid overpowering scents or other issues.

Q: How do I prevent frosting on my soy wax candles?

A: To prevent frosting on your soy wax candles, try pouring at a lower temperature and cooling them slowly.