Katerina Swanson
Cross-linked polyethylene is an extremely durable plastic that is sometimes used for fuel tanks. However, it is not easily repaired. Because it is a thermoset plastic, it is not meltable, and traditional welding methods cannot be used. Instead, an airless plastic welder and low-density polyethylene welding rod can be used to repair punctures, cracks, and holes. While some have suggested using epoxy glue, this method is not recommended as the glue is rigid and will crack as the fuel tank expands and contracts.
Characteristics and Values Table for Repairing a Cross-Linked Poly Fuel Tank
| Characteristics | Values |
|---|---|
| Repair Products | G/flex epoxy, Polyvance's KCWPRO airless plastic welder, low-density polyethylene welding rod, special 2-component epoxy glue |
| Repair Process | Clean the tank, sand the area, heat the area, apply epoxy or glue, weld using a plastic welder, fill with water before applying flame |
| Challenges | Cross-linked polyethylene is not easily repaired, it is a thermoset plastic that is not meltable, glues do not stick to it, mechanical patches may be risky |
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What You'll Learn
Using Polyvance's KCWPRO airless plastic welder
Cross-linked polyethylene is an extremely durable plastic that is sometimes used for fuel tanks, kayaks, canoes, and older ATV parts. While it is not very common, it is not easily repaired. It is a thermoset plastic, which means it is not meltable, so a nitrogen plastic welder or a regular airless plastic welder cannot be used to create a fusion weld.
Polyvance's KCWPRO airless plastic welder can be used to repair a puncture, crack, or hole in a cross-linked polyethylene fuel tank. This is done through bonded repair, using a low-density polyethylene (LDPE) welding rod as a hot melt adhesive. The LDPE rod is easier to use than a high-density polyethylene (HDPE) rod due to its lower melting temperature. However, HDPE is tougher and more abrasion-resistant, so it may be preferable if you can tolerate slower, more difficult welds.
To use the KCWPRO welder, start by cleaning the fuel tank with a plastic cleaner and wiping it dry with a clean, lint-free towel. Ensure the surface is completely dry before continuing. Next, use a die grinder or Dremel tool to expose the raw plastic around the crack or hole, about half an inch on all sides. Then, use the sharp edge of the welder tip to melt a 1-to-2-inch groove in the plastic along the crack, and push the displaced plastic back into the groove. Smooth the plastic using the tip of the welder. Remember to only work in small 1-to-2-inch sections at a time to maintain heat. Continue this process along the entire crack or hole.
For added reinforcement, you can embed a piece of stainless steel wire mesh into the welded area. Cut the mesh to fit the prepped area, place it onto the plastic, and bend it to shape if necessary. Lay the welder tip on top of the mesh to melt the plastic underneath. Once the plastic is melted, use a metal tool to push the mesh deep into the melted plastic, working in small sections at a time. Continue until the mesh is fully embedded.
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Epoxy glue for repairs
Cross-linked polyethylene (PEX) is an extremely durable plastic that is sometimes used for fuel tanks, kayaks, canoes, and older ATV parts. However, it is not easily repaired because it is a thermoset plastic that cannot be melted. While some sources suggest replacing the tank entirely, others recommend using a product called G/flex from West Systems, which can be used to fix PEX plastics.
When using epoxy to repair a fuel tank, it is important to first clean the surface of any grease or dirt to ensure optimum adhesion. One product that can be used is Permatex Fuel Tank Repair Epoxy, a two-part, hand-kneadable putty-type epoxy stick. The coloured materials are mixed together to form a uniform colour, indicating thorough mixing. The resulting cured adhesive can be drilled, sanded, threaded, or filed and is resistant to fuels and most solvents after a full cure.
It is important to note that some customers have reported mixed experiences with the Permatex epoxy, with some saying it works great while others claim it failed. Therefore, it is essential to properly prepare the surface before applying the epoxy to ensure the best results.
When using epoxy for repairs, it is crucial to follow the manufacturer's instructions and safety guidelines. Epoxy can be toxic and should be handled with care. It is also important to ensure that the repair area is well-ventilated during the application and curing process.
In addition to the epoxy glue, other materials may be needed for the repair, such as cloth or a welding rod. The cloth should be a tight-weave fabric for patchwork, and the welding rod should match the colour of the cross-linked polyethylene to make the repair less visible.
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Using a propane torch to oxidise the surface
Cross-linked polyethylene is an extremely durable plastic that is sometimes used for fuel tanks. It is not easily repaired because it is a thermoset plastic, which means it is not meltable. Traditional methods of repair such as gluing will not work on this material as nothing will stick to it.
However, a propane torch can be used to oxidise the surface of the plastic, allowing materials to adhere to it. This method was discovered by Gougeon Co. and involves using a flame to contact the non-polarized plastic surface, which then oxidises into a polarized surface. This process enables materials to stick to the plastic in a normal fashion.
Before using a propane torch to oxidise the surface of the fuel tank, it is important to take some safety precautions. The tank should be completely empty and thoroughly cleaned. It is also recommended to fill the tank with water before applying any flame to it.
Once the safety precautions have been taken, the propane torch can be used to carefully apply a flame to the surface of the fuel tank. It is important to follow the instructions provided by Gougeon Co. for the best results. After the surface has been oxidised, a patch can be applied to the tank, and it should adhere successfully.
While this method can be used to repair a cross-linked poly fuel tank, it is important to note that some people may prefer to replace the tank entirely rather than attempt a repair due to the flammable nature of the contents.
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Sanding the area before applying heat
Cross-linked polyethylene is a thermoset plastic, which means it is not meltable. It is extremely durable, but unfortunately, it is not easily repaired. It is sometimes used for fuel tanks, kayaks, canoes, and older ATV parts.
When repairing a cross-linked poly fuel tank, it is important to note that there is no glue that will stick to the surface, and it cannot be welded. A mechanical patch can be used, but it is important to fill the tank with water before applying any flame to it due to the flammable nature of the tank's contents. One product that can be used for repairs is G/flex from West Systems, which can be used to fix PEX plastics.
Before applying heat to the repair area, it is important to prepare the surface. While some sources suggest that sanding or grinding the area is not necessary, others recommend using acetone to clean the work area and ensure a smooth surface for the repair. This can help the epoxy to bond better to the tank. It is also important to consider the weight of the cloth and the type of fabric used for patchwork, as a tight weave fabric is recommended.
Overall, when repairing a cross-linked poly fuel tank, it is crucial to follow the instructions provided by the product manufacturer, such as Gougeon, and to prioritize safety due to the flammable nature of the tank's contents.
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Filling the tank with water before applying heat
When repairing a cross-linked poly fuel tank, it is crucial to prioritize safety measures due to the flammable nature of the fuel and the potential risks associated with the repair process. Filling the tank with water serves as a safety buffer by providing a physical barrier between the heat source and the flammable fuel residue that may be present in the tank. This helps to mitigate the risk of accidental ignition or fuel vapor explosion during the repair process.
Additionally, filling the tank with water can also aid in identifying and repairing leaks. By conducting a pressure test, where air pressure is applied to the tank, any leaks can be detected by observing air bubbles escaping from the repaired areas. This process ensures the effectiveness of the repair and helps to pinpoint areas that may require additional attention or reinforcement.
It is important to note that repairing a cross-linked poly fuel tank can be challenging due to the nature of the material. Cross-linked polyethylene has low surface energy, which means substances typically do not adhere to it. However, specific repair methods, such as using a propane torch to oxidize the surface, can enhance adhesion and facilitate the bonding process.
When preparing to apply heat to the tank, it is essential to follow safety protocols and guidelines provided by manufacturers or experts in the field. This may include wearing appropriate protective gear, ensuring proper ventilation, and having fire safety equipment readily available. By taking these precautions and filling the tank with water, individuals can minimize potential hazards and increase the likelihood of a successful and safe repair.
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Frequently asked questions
Cross-linked polyethylene is an extremely durable plastic that is not easily repaired. It is not meltable, so you cannot use a nitrogen plastic welder or airless plastic welder to repair it. Instead, you can use Polyvance's KCWPRO airless plastic welder and low-density polyethylene welding rod to repair punctures, cracks, and holes.
You can use a special 2-component epoxy glue like G/flex from West Systems.
Empty the tank of fuel and leave it opened to release pressure. Clean the tank inside and out, and use acetone to clean the work area.
Some sources suggest replacing the tank entirely, as it is difficult to repair. Cross-linked polyethylene is a low surface energy plastic, meaning nothing will stick to it. However, a propane torch can be used to oxidize the surface and allow materials to stick to it.
