Maya Ellison
There are many different types of adhesives available for bonding plastics, and the best adhesive for the job will depend on the type of plastic being used and the nature of the project. Some common plastics include ABS, PVC, polystyrene, polyethylene, and polypropylene, each of which may require a different type of adhesive. For example, ABS plastics are commonly used in structural applications and require a strong adhesive such as epoxy or cyanoacrylate glue, while polyethylene and polypropylene have low surface energy, requiring special adhesives designed to penetrate their surfaces. Other factors that can affect the choice of adhesive include temperature, humidity, and whether the object will be exposed to moisture.
| Characteristics | Values |
|---|---|
| Best adhesive for GTX plastic | PlasticWeld, Loctite Epoxy Plastic Bonder, Loctite Vinyl, Fabric & Plastic Flexible Adhesive, SuperTAC 500, Weld-On 16, Super Glue, Contact Cement, Model Cement, Polyurethane, Epoxy |
| Best adhesive for ABS plastic | Epoxy, Cyanoacrylate, ABS solvent adhesives, Structural adhesive |
| Best adhesive for Acrylic | Acrylic solvent adhesive, Cyanoacrylate |
| Best adhesive for Polyethylene and Polypropylene | Infinity SuperTAC 500, MMA 500, Loctite AA 3035 Acrylic Adhesive |
| Best adhesive for PLA | Weld-On 16, Super Glue, Contact Cement, Model Cement, Polyurethane, Epoxy |
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What You'll Learn
Cyanoacrylate glue
When cyanoacrylate comes into contact with hydroxyl ions in water, it cures almost instantly, transforming into a plastic state. This is why cyanoacrylate glue needs water to cure and can be activated by the moisture on the surface of the material being bonded or the humidity in the air. However, this also means that certain materials, such as heat-resistant plastics, which repel moisture, may not be suitable for bonding with cyanoacrylate glue.
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Epoxy-based adhesives
Epoxies offer exceptional bonding strength, with some variations boasting strengths of over 30 MPa. They are particularly effective for bonding ABS plastics, providing the highest-strength adhesive option for this type of plastic. G/flex Epoxy, for example, has been specifically designed to bond with a variety of plastics and has been shown to form dependable bonds with certain plastics that have been abraded or flame-treated. Loctite's Epoxy Plastic Bonder is another strong and fast-acting option, although it is not recommended for objects exposed regularly to moisture.
When using epoxy-based adhesives, it is important to consider the type of plastic being bonded and to prepare the surface accordingly. Some plastics, such as polypropylene and acrylic, can be challenging to glue reliably, even with surface treatments. Additionally, the thickness of the plastic can impact the bonding process, with thinner plastics being more flexible and less stressful for the adhesive joint.
Overall, epoxy-based adhesives offer a strong and versatile option for bonding GTX plastic, with the added advantage of being readily available from manufacturers and suppliers such as The Home Depot.
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Polyethylene and polypropylene glues
Polyethylene (PE) and polypropylene (PP) are the two most commonly used plastics. They are also the two most difficult substrates in adhesive bonding applications. This is due to their low surface energy, which causes most adhesives to bead up on the surface instead of penetrating it.
To combat the low surface energy of these materials, you can use the right surface preparation and plastic adhesives designed for the job. For instance, certain surfaces can be pre-treated with techniques such as flame and plasma treatments. Additionally, there are specialty polyethylene and polypropylene glues that are created with these difficult substrates in mind.
- Infinity SuperTAC 500 Plastic Bonding Glue Stick: This product can bond a wide range of plastics, including PP and PE. It comes in 1/2" sticks and can be used with a standard temperature glue gun without the need for additional pre-treatment. It also has high resistance to extreme temperatures.
- Infinity Bond MMA 500: This is a two-part adhesive that bonds difficult plastics like polyethylene and polypropylene better than almost anything on the market. It requires a cartridge gun and static mixer for dispensing. Little to no surface prep is required before applying the MMA 500. It has a 4-5 minute open time and will create a permanent bond with chemical adhesion within 24 hours.
- Loctite AA 3035 Acrylic Adhesive: This is a PE and PP glue that does not require additional surface preparation before application. It is pale yellow in colour and comes in a 1-to-1 mix ratio. It cures at room temperature and has a short work life of around 7 minutes. It is also low odour and non-flammable.
- 3M VHB: This is a thicker adhesive designed for low surface energy materials.
While these are great adhesives for many applications involving polyethylene and polypropylene gluing, they may not be the best choice for your particular application. It is important to consider the specific requirements of your project, such as the strength, temperature resistance, and flexibility needed.
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Structural adhesives
When it comes to bonding GTX plastic, a two-part unfilled epoxy structural adhesive is recommended for high-strength and impact-resistant applications. These epoxies consist of an epoxy resin on one side and a hardener on the other. When mixed, they interlink and cure to form a strong bond.
One-part epoxies are also available, but they require elevated temperatures to initiate curing. Epoxies are known for their strength, with some variations offering strengths of over 30 MPa.
Other types of structural adhesives used for plastic bonding include polyurethane adhesives and acrylic adhesives. Polyurethane adhesives, such as Henkel's LOCTITE® PURBOND®, are suitable for bonding various substrates, including plastic, metal, and wood. They offer strong resistance to humidity and other environmental factors, contributing to their cohesive strength and flexibility.
Acrylic adhesives, on the other hand, are formulated for bonding difficult-to-bond substrates like nylon-based alloys, epoxy composites, and modified polyesters. They are flexible, fast-setting, and offer high shear strength with good peel performance.
The choice between these structural adhesives depends on the specific requirements of the application and the desired characteristics of the bond.
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Super glue
When it comes to GTX plastic, super glue can be an effective adhesive, but it is essential to choose a super glue specifically designed for use on plastic to ensure a reliable bond. Some super glues, such as Gorilla Super Glue, are formulated to bond with a wide range of materials, including most plastics. It is important to note that certain difficult-to-bond plastics, such as polyethylene and polypropylene, may not form good bonds with super glue due to the lack of moisture on their surfaces.
To achieve the best results when using super glue on GTX plastic, it is recommended to follow these steps:
- Choose a super glue specifically designed for use on plastic, such as Gorilla Super Glue or Loctite Super Glue Liquid Professional.
- Ensure the plastic surface is clean and free of any debris or residue.
- Apply the super glue to the surface and join the pieces together quickly, as super glue dries fast.
- Hold the pieces firmly in place for a few seconds to allow the glue to set and cure.
- Avoid pulling or stressing the bonded area immediately, as the adhesive needs time to fully cure and reach maximum strength.
It is important to note that super glue can be difficult to remove once it has cured, and it may require multiple applications of warm soapy water or acetone to soften and remove the adhesive. Therefore, it is recommended to work in a well-ventilated area and protect the surrounding surfaces before using super glue. Additionally, super glue is generally not food safe and should be avoided for items that will come into contact with food or be placed in a microwave, oven, or dishwasher.
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