Ethan Clarke
Epoxies are one of the most successful plastics families and have been around for over 50 years. They can be used to bond a wide range of materials, including metal to plastic. However, epoxies don't adhere well to most plastics, including ABS plastic. With proper surface preparation, it is possible to achieve adhesion to many plastics. For example, ABS will bond well with most epoxies without flaming if the surface is roughened and wiped down with acetone.
| Characteristics | Values |
|---|---|
| Bonding ABS to epoxy | Roughen the ABS surface, wipe down with acetone, then apply epoxy |
| Bonding method | Fusing or welding with a chemical solvent |
| Common solvents | Methyl Ethyl Keytone (MEK) and Acetone |
| Common adhesives | Cyanoacrylate, 2-component epoxy, structural acrylic, UV-curable adhesives, MMA adhesive, JB weld |
| Bonding to other materials | Epoxies can bond metal to plastic |
| Bonding to acrylic | Solvent or thermoplastic adhesive such as Acri-Bond 120 |
| Bonding to Delrin or Acetal | Loctite Epoxy or Bondit |
| Bonding to fiberglass | Aeropoxy |
| Bonding to concrete | Epoxy-based glues |
| Bonding to other plastics | Gorilla Epoxy |
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What You'll Learn
Epoxy resins can bond to ABS plastic
Epoxy resins, on the other hand, are a group of adhesives that have been used for over 50 years and are known for their versatility and strength. They can be used to bond a wide range of materials, including steel, aluminium, glass, wood, ceramics, and most plastics.
However, one challenge with bonding epoxy to ABS plastic is that epoxy tends to form beads on the surface of some plastics, similar to water on a waxed finish. This is because plastics like ABS often lack surface texture, making it difficult for the epoxy to form a strong bond. To overcome this issue, the ABS surface can be treated to create a better mechanical bond. This can be done by roughening the surface with sandpaper, creating random patterns, or drilling small holes for the epoxy to flow into, essentially creating "epoxy rivets". The deeper the scratches or holes, the stronger the bond. Additionally, cleaning the surface with acetone or alcohol before and after sanding can further enhance adhesion.
It is important to note that while these methods can improve the bond between epoxy and ABS plastic, they may not always result in a perfect adhesion. The only way to know for sure if an epoxy will bond to a specific material is to try it. However, with proper surface preparation, it is possible to achieve excellent adhesion between epoxy resins and ABS plastic.
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Roughen the ABS surface for better adhesion
Epoxies are known for their strength and are the highest-strength adhesive option for bonding ABS plastic. They have a high chemical and water resistance, making them ideal for use in environments with high volumes of water or exposure to chemicals.
However, one of the drawbacks of using epoxy is its brittleness. If there is significant movement in the structure, the epoxy may crack due to its lack of flexibility. Therefore, it is important to properly prepare the ABS surface to ensure a strong bond and reduce the likelihood of cracking.
To prepare the ABS surface for better adhesion with epoxy, it is recommended to roughen the surface. This can be done by using sandpaper and dragging it several times in one direction over the surface. This process optimizes the adhesion of the epoxy by providing a textured surface for the epoxy to grip onto.
In addition to roughening the surface, it is important to clean and degrease the ABS surface. This can be done by using acetone and a lint-free cloth to wipe down the surface. It is crucial to wear gloves during this step to prevent finger grease from transferring back onto the surface and affecting the adhesive result.
By following these steps and properly preparing the ABS surface, you can achieve a stronger bond between the epoxy and the ABS plastic, reducing the chances of cracking or failure.
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Clean the ABS surface with acetone and alcohol
To prepare ABS for bonding with epoxy, it is important to clean and roughen the surface. This can be achieved by using acetone and alcohol.
Acetone is particularly effective at dissolving ABS, creating a smooth surface. This process, known as acetone vapour polishing or acetone vapour baths, involves exposing the ABS surface to acetone vapours. The vapours cause the ABS to dissolve slightly, resulting in a glossy, smooth finish. It is crucial to use pure acetone and exercise caution as acetone is flammable and an irritant to the skin and eyes.
Before exposing the ABS to acetone vapours, it is recommended to file the surface with sandpaper or alcohol to break down any aggressive points or layers that acetone may not be able to remove. This ensures a smoother final result.
Additionally, alcohol, such as isopropyl alcohol (IPA), can be used to clean and degrease the ABS surface. IPA is a milder solvent compared to acetone and is effective at removing impurities without damaging the ABS.
By following these steps and using a combination of acetone and alcohol, you can effectively clean and prepare the ABS surface for bonding with epoxy.
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Epoxy doesn't adhere well to most plastics
Epoxy resin adhesives will bond with almost all types of wood, although a primer sealer is often recommended for many types of wood to seal it. Resin does not bond to Teflon, polyethylene, polypropylene, nylon, or Mylar. It also bonds poorly to polyvinyl chloride, acrylic, and polycarbonate plastics.
To treat ABS so that it will bond with epoxy resin, the ABS surface should be roughened and degreased with sandpaper and alcohol, and then quickly passed over a flame. It is also recommended to roughen the backside of the plastic so that it gets a good grip.
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Alternatives to epoxy for bonding ABS plastic
While epoxy adhesives are known for their strength, they are prone to cracking when bonding ABS plastic due to their brittleness. If you are looking for alternative adhesives that offer more flexibility, here are some options:
Methyl Methacrylate (MMA) Adhesives
MMA adhesives are almost as strong as epoxies, with bond strengths up to 20 MPa. While they also exhibit some brittleness, they are more flexible than epoxies and can be a good alternative when used in small quantities. However, one of the main drawbacks of MMA adhesives is their exothermic reaction, which can cause witnessing on the surface of the ABS plastic.
Polyurethane Adhesives
Polyurethane adhesives have a gradual cure time, similar to epoxies, but this can be affected by external temperatures and may not always be consistent. These adhesives typically require surface preparation before application. While they may not have the same strength as epoxies, they can be a good alternative when flexibility is a priority.
MS Polymer Adhesives
According to adhesive specialists, MS polymer adhesives are recommended as the best option for bonding ABS plastic. While specific bond strengths are not mentioned, their performance is likely comparable to or better than epoxies for this application.
Cyanoacrylate Adhesives (Superglue)
Superglue is a common adhesive that can be used for small and selective bonding applications. It cures quickly and forms strong bonds. However, similar to epoxies, superglue can also result in brittle bonds.
When choosing an alternative adhesive to epoxy for bonding ABS plastic, it is important to consider the specific requirements of your application, such as the strength needed, flexibility required, cure time, and surface preparation needed. Each type of adhesive has its own unique characteristics, and the right choice depends on your specific needs.
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Frequently asked questions
Epoxy does not bond well with ABS plastic. However, with proper surface preparation, it is possible to achieve adhesion.
A few common adhesives that can be used to bond ABS plastic include cyanoacrylate, 2-component epoxy, structural acrylic, and UV-curable adhesives.
To prepare the surface of ABS plastic for bonding with epoxy, you can roughen it up with sandpaper and wipe it down with acetone or alcohol. You can also create random patterns or drill small holes in the ABS plastic to act as epoxy rivets.
Yes, alternative adhesives to epoxy for bonding ABS plastic include MMA adhesives, ABS cement, and JB weld.
