
Plastic barrels are used for various purposes, from storing food, drinking water, and rainwater to transporting and storing industrial chemicals. They are produced from high-density polyethylene (HDPE), a durable high-grade plastic that won't react with most chemicals. Due to their durability, they can be reused multiple times, making them cost-effective. However, it is crucial to properly clean and sterilize plastic barrels to ensure their longevity and safety. This process involves removing any residual chemicals or contaminants and can be achieved through various methods, such as using water-based solvents, bleach solutions, vinegar, or specific chemical cleaners. Proper safety precautions and the correct choice of cleaning agents are essential to effectively sterilize a plastic barrel and maintain its integrity for future use.
How to Sterilize a Plastic Barrel
| Characteristics | Values |
|---|---|
| Barrel previously used for toxic substances | Do not reuse |
| Barrel previously used for pesticides | Do not reuse |
| Barrel previously used for food | May be reused for non-food purposes |
| Barrel previously used for chemicals | Contact local hazardous waste disposal centre |
| Barrel to be used for food | Use food-grade barrels |
| Barrel to be used for drinking water | Rinse, fill with fresh water, leave overnight, rinse again |
| Barrel to be used for wine | Clean, then sanitise with citric acid and sodium bisulfite |
| Barrel to be sanitised | Use hot water, soda ash, and a stiff brush |
| Barrel to be cleaned | Use water, vinegar, baking soda, bleach, or commercial cleaner |
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What You'll Learn

Use water-based cleaning solvents
Water-based cleaning solvents are the best choice when you’re cleaning chemicals from plastic barrels. They have a lower chance of reacting chemically with the residue of substances you’re cleaning. The water-based solvent dissolves the chemicals and other contaminants, safely removing the substances from the barrel.
Before using a water-based cleaning solvent, it is important to determine the appropriate cleaning substance based on the chemical previously stored in the barrel. Chemical manufacturers can tell you which cleaning products are safe to use and will not cause chemical reactions. Using the wrong substances can cause unwanted chemical reactions. For instance, if your plastic barrel contains acidic substances, you need to neutralize the acid using an alkaline solution before cleaning.
Water-based cleaning solvents can be used in conjunction with a pressure washer to clean your barrels. This is more time-efficient and easier than scrubbing the barrel by hand. When using a pressure washer, take care not to scratch or damage the plastic as it could result in cracks or fractures that compromise the barrel’s integrity. Opt for soft-bristled brushes made from nylon or other non-abrasive materials.
After cleaning the barrel with a water-based solvent, rinse the barrel thoroughly with fresh water. Then, dry the barrel completely using a clean cloth. If desired, you can also rinse the barrel with a mild soap solution before drying.
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Avoid cross-contamination
To avoid cross-contamination when sterilizing a plastic barrel, it is important to take several precautions. Firstly, always use food-grade barrels to prevent contamination, and never repurpose a barrel that previously held toxic substances or chemicals. Even if the barrel is cleaned, chemicals can leach into the inner plastic over time and contaminate any food or liquids inside.
Before cleaning, inspect the barrel for any damage, wear, or corrosion. Broken barrels can be repaired, but those showing signs of corrosion should not be used for storing chemicals or food. If there is visible damage, the barrel should not be used for storing chemicals. Check all areas of the barrel for chemical residue, as any leftover chemicals can contaminate future contents.
When cleaning the barrel, select an appropriate cleaning solution based on the type of chemical that was previously stored in it. Always read the labels carefully and ensure the cleaning solution is safe for use on plastics. Avoid using harsh chemicals or abrasive materials that can damage the barrel. Instead, use soft-bristled brushes made from nylon or other non-abrasive materials.
After cleaning, rinse the barrel thoroughly with warm water and a mild soap solution. Repeat the rinsing process if any residue remains. This step is crucial to ensuring the barrel is free of contaminants. Once rinsed, air-dry the barrel completely using a clean cloth or air-drying methods to prevent the introduction of new contaminants.
Additionally, when storing liquids in the barrel, use a specialty drinking water hose instead of a garden hose to fill it up. This helps prevent contamination from external sources. If storing multiple types of substances, use drum liners to create a separate inner lining, preventing the liquid from touching the sides of the barrel and reducing the risk of cross-contamination.
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Use food-grade barrels
Food-grade plastic barrels are used across various industries, including food and beverage storage, pharmaceuticals, and chemicals. These barrels are made from high-density polyethylene (HDPE), a durable, high-grade plastic that meets FDA standards for food contact. They are safe for storing food, drinks, grains, oils, powders, pharmaceuticals, and chemicals.
When using food-grade plastic barrels, it is essential to ensure proper cleaning and maintenance to maintain their integrity and prevent contamination. Here are some general guidelines for sterilizing and caring for your food-grade plastic barrels:
- Always clean and sanitize your barrel before its first use, especially if it is a used barrel.
- For a thorough cleaning, fill the barrel halfway with hot water, add a cleaning agent such as soda ash, citric acid, or a mild dish soap, and shake or roll the barrel to mix. Then, finish filling the barrel with hot water, secure the lid, and continue rolling or rotating it several times over a 24-hour period.
- After cleaning, rinse the barrel several times with clean water to remove any residual cleaning agents.
- To sanitize the barrel, use a solution of bleach and water. Add one tablespoon of unscented bleach per gallon of water, swirl the solution around the drum, wait for 30 minutes, and then rinse with clean water.
- Allow the barrel to air-dry completely before reuse to prevent bacterial growth or mildew.
- Inspect your barrel regularly for any damage or wear and tear. If cracks or leaks develop, repair them using sandpaper, a plastic sheet, a drywall adhesive patch, and a waterproof sealer.
- If you are not using the barrel for an extended period, keep it filled with a sanitizing mixture, such as the citric acid and sodium bisulfite solution mentioned earlier, to maintain its cleanliness.
By following these steps, you can effectively sterilize and maintain your food-grade plastic barrels, ensuring the safe storage of food and other sensitive materials.
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Clean before sanitising
It is important to clean a plastic barrel before sanitising it. This is because plastic barrels are often used to store and transport chemicals, food, pharmaceuticals, and other hazardous materials. If the barrel previously stored chemicals, these can leach into the inner plastic over time and contaminate any new contents. Therefore, it is crucial to clean and inspect your barrel before sanitising and reusing it.
Firstly, empty and rinse the barrel several times with water to remove any residual solution. You can also use a garden hose to spray and rinse the outside of the barrel, removing any visible dirt. If the barrel contained chemicals or hazardous materials, it is essential to contact your local hazardous waste disposal centre for advice on properly disposing of any remaining substances before cleaning.
Next, create a cleaning solution to thoroughly clean the barrel. One method is to mix vinegar, baking soda, and water. You can fill the barrel a quarter full of water and add a half-gallon of vinegar and a box of baking soda. Alternatively, you can use equal parts water and vinegar without the need for additional rinsing. Baking soda can help neutralise the vinegar smell, especially if the barrel was previously used for vinegar storage.
Another effective cleaning solution involves using bleach and water. Fill the barrel a quarter full of water and add a cup of bleach. Close the caps and leave the solution overnight for a deeper clean. Rotate or roll the barrel around to ensure the entire interior is cleaned. Remember to empty and rinse the barrel thoroughly after using a bleach solution, as the smell may irritate pets or neighbours.
If you are preparing a used barrel for storing wine, a mixture of soda ash, sal soda, or sodium carbonate can be used. Mix two ounces of either of these substances with three gallons of water. Additionally, for wine barrels, it is recommended to use 0.5 pounds of citric acid and 1 pound of sodium bisulfite for every 50 gallons of barrel capacity. These measurements do not need to be exact but should not be less than the stated amounts.
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Avoid certain chemicals
When sterilizing a plastic barrel, it is important to avoid using harsh chemicals that can damage the material. While plastic barrels are designed to withstand a wide range of industrial chemicals, certain substances can compromise the integrity of the plastic.
One of the most common mistakes made when cleaning plastic barrels is using harsh chemicals, such as steel wool or wire brushes, which can scratch and damage the surface. These abrasive materials should be avoided as they can leave the barrel susceptible to cracks and fractures. Instead, opt for soft-bristled brushes made from nylon or other non-abrasive materials.
It is also important to avoid using abrasive cleaning solutions. Always read the label on your cleaning solution carefully and ensure it is safe for use on plastics. Water-based solvents are generally recommended for cleaning plastic barrels as they effectively dissolve chemicals and contaminants without damaging the plastic. However, it is crucial to select a cleaner that is suitable for the specific chemical being removed from the barrel. Chemical manufacturers can advise on the appropriate cleaning products that will not cause a hazardous reaction or damage the barrel.
Additionally, avoid using subpar equipment when cleaning plastic barrels. Investing in high-quality tools, such as a high-pressure washer, soft-bristled brushes, and a respirator, is crucial for achieving optimal cleaning results while also protecting your health and safety.
By avoiding harsh chemicals and abrasive materials, you can effectively sterilize a plastic barrel without compromising its integrity. Proper cleaning and maintenance of plastic barrels ensure their longevity and allow for safe reuse.
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Frequently asked questions
If your plastic barrel contained chemicals, it could be dangerous to clean or reuse the barrel. Contact your local hazardous waste disposal centre for advice on how to dispose of any remaining material before you begin cleaning. Once empty, you can sterilize the barrel using a mixture of water and bleach, or water and vinegar.
If your plastic barrel contained food, it's important to ensure that it is free of bacteria, mould, and mildew. You can do this by using a mixture of water and bleach, or water and vinegar. If there is a strong smell, you can use baking soda to neutralize it.
If you plan to use your plastic barrel to store drinking water, it is crucial to ensure that it is thoroughly sanitized. You can do this by using a mixture of water and bleach, leaving it overnight, and then rinsing it out several times to ensure that all the bleach is removed.
It is important to wear proper protective gear when sterilizing a plastic barrel. Additionally, always inspect your barrel for any damage or wear before cleaning. If there are any cracks, you can repair them using sandpaper, a plastic sheet, a patch with drywall adhesive, and a waterproof sealer.










































