Maya Ellison
Choosing the right adhesive for plastic can be tricky as some plastics are impossible to glue, while others are easy to glue. The type of plastic you are working with is the most important factor in choosing the right adhesive. For example, polypropylene and polyethylene are very difficult for adhesives to bond to, while polyvinyl chloride (PVC) is easy to glue using irrigation pipe PVC glue. If you are working with polystyrenes, which are commonly used for disposable items like plastic cutlery and toys, poly cement and super glue work well. If you are looking for a flexible bond, an acrylic-based glue is a good option. Epoxy glue is another versatile option that works with most plastics and comes in a two-part mixture.
| Characteristics | Values |
|---|---|
| Best glue for plastic | Epoxy glue, super glue, polystyrene cement glue, Gorilla glue |
| Type of plastic | Polypropylene, Polyethylene, PVC, Polystyrenes |
| Type of glue | Waterproof, flexible, quick-drying, strong |
| Other factors | Temperature, humidity, exposure to elements, vibration, heat, moisture |
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What You'll Learn
Epoxy glue is best for most plastics
When it comes to gluing plastic, there is no one-size-fits-all solution. The best adhesive depends on various factors, including the type of plastic, the application, and your budget. However, epoxy glue stands out as a versatile and robust option for bonding most plastics.
Epoxy glue is renowned for its exceptional strength and durability. It is formed by combining a hardener and a resin, resulting in a chemical reaction that creates an incredibly strong bond. This makes it ideal for repairing plastic items that require a high level of durability, such as furniture or outdoor equipment. Epoxy glue is so strong that it can even bond metal, wood, and ceramic pieces to plastic, making it a versatile adhesive for various DIY projects.
One notable advantage of epoxy glue is its ability to act as a filler. This means that it can not only repair cracks and breaks in plastic items but also fill in gaps and imperfections, restoring the item to its original state. Additionally, epoxy glue is waterproof, making it suitable for repairing items that will be exposed to water or outdoor conditions.
When using epoxy glue, it is essential to follow the manufacturer's instructions carefully. The application process typically involves applying the desired amount of epoxy to both surfaces, pressing them together, and clamping them in place until the epoxy sets. The cure time can vary, so it is important to refer to the manufacturer's guidelines. To speed up the curing process, you can apply heat gently with a blow dryer set on warm.
While epoxy glue is a fantastic option for bonding most plastics, it is important to choose an epoxy compatible with the specific type of plastic you are working with. Some plastics, such as polyethylene and polypropylene, can be challenging to glue, so selecting an adhesive specifically designed for those materials is crucial. Additionally, consider the bonding environment and choose an epoxy with the appropriate set time, bond strength, and temperature tolerance for your project.
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Acrylic-based glue is best for a flexible bond
When it comes to gluing plastic, there is no one-size-fits-all solution. The best adhesive depends on the type of plastic, the application, and personal preferences. That being said, acrylic-based glue stands out as a top choice for those seeking a flexible bond.
Acrylic, also known as polymethyl methacrylate (PMMA), is a versatile material with a surface that readily accepts adhesive bonding. In fact, the bond strength often surpasses the substrate strength, resulting in a durable and long-lasting hold. One of the key advantages of using an acrylic-based glue is its flexibility. This makes it ideal for bonding flexible materials to rigid surfaces, such as photographs to acrylic, ensuring that the final product remains intact without compromising the flexibility of the material being adhered.
When selecting an acrylic-based glue, opt for a product that cures with UV or visible light, such as UV-curable adhesives. These adhesives offer a strong, flexible bond and are widely available in grades suitable for bonding acrylic. For instance, Permabond offers UV632, UV639, and UV645 adhesives, all of which result in a bond stronger than the substrate. Additionally, consider using MS Polymers for a flexible bonding solution. MS359 CLEAR, for example, is a good choice for achieving a clear finish, as it is designed to be transparent.
While cyanoacrylate adhesives, commonly known as super glues, can be used for bonding plastic, they may not be the best option for acrylic-to-acrylic bonding. These adhesives tend to be better suited for bonding acrylic to other materials, such as wood. When working with opaque acrylic, various types of glue can be used successfully, but for clear acrylic, it's important to choose a crystal clear, non-yellowing adhesive to ensure the glue is inconspicuous.
It's worth noting that the surface to be bonded should be clean, dry, and contamination-free for optimal results. Additionally, some engineers opt for a solvent wipe before bonding or for cleanup afterward, using isopropanol or a dedicated cleaner like Permabond Cleaner A. However, be cautious as some solvents, like acetone, can be too aggressive and damage the plastic. With the right acrylic-based glue and surface preparation, you can achieve a strong, flexible bond for your plastic application.
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Poly cement and super glue work well for polystyrenes
Polystyrene is a type of plastic that is often used in food packaging and crafts. It is typically clear and brittle, like imitation glass or a CD case. When it comes to gluing polystyrene, poly cement is a good option. Poly cement comes in two varieties: gel/tube type and liquid solvent. The gel/tube type is best applied to flat surfaces, while liquid solvents are ideal for seams. When using liquid solvents, it's important to get the right degree of flow along the seam to create a consistent, continuous weld without damaging the model's surface.
Another option for gluing polystyrene is super glue, also known as cyanoacrylate. Super glue works well for quick fixes and can be used with polystyrene, but it may melt the material slightly. It is important to work quickly when using super glue on polystyrene to avoid melting. Super glue works best when the surfaces are less smooth, so sanding the plastic surface before application can improve adhesion.
When choosing an adhesive for polystyrene, it's important to consider the type of application and the budget. While super glue can be more expensive, it offers strong bonding and can be used for various repairs and projects. On the other hand, poly cement may be more suitable for specific applications, such as joining clear parts or creating seamless finishes.
In addition to poly cement and super glue, other adhesives can be used for polystyrene. PVA glue, also known as white glue, is a cost-effective option that works well for general bonding. It is often used in terrain building and can be applied with a brush or a caulking gun. When working with polystyrene, it is always recommended to do a test on disposable material to ensure the glue is compatible and to follow safety precautions, such as working in a well-ventilated area and wearing safety glasses.
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Specialised hard plastic glue is required for heavy plastics
When it comes to gluing heavy plastics, it's important to select a specialised hard plastic glue to ensure a strong and durable bond. Different types of plastics require different types of adhesives, and heavy plastics often necessitate specific types of glue.
Hard, high-density plastics, such as those used for buckets, crates, or containers, are typically made from polyethylene or polypropylene. Ordinary adhesives like wood glue or white glue are not suitable for these plastics and will not form permanent bonds. Instead, opt for a plastic adhesive specifically formulated for use with polyethylene or polypropylene, such as the Loctite Plastics Bonding System, a two-part cyanoacrylate adhesive. Cyanoacrylate, also known as super glue, is suitable for various repairs and projects involving plastics. It works best on less smooth surfaces, so consider sanding the plastic before application.
For gluing PVC, which is commonly used in plumbing, a two-part primer and PVC solvent cement are typically required. Polystyrene, often used for disposable cutlery, plastic bowls, and fashion bags, can be effectively bonded with a poly cement, epoxy, or cyanoacrylate. Epoxy adhesives, formed through the chemical reaction between a hardener and resin, are among the strongest options for plastic and can be used on a variety of materials. They also offer excellent chemical resistance.
When working with flexible plastics, such as those found in shoes or toys, look for adhesives specifically designed for these materials, like the Loctite Vinyl, Fabric & Plastic Flexible Adhesive. This type of adhesive dries clear, remains flexible, and can withstand UV exposure without yellowing. For bonding materials like polycarbonate, acrylic, or nylon, the Loctite Plastic Bonder, with its specialised acrylic formula, provides a strong and impact-resistant bond.
Before gluing any plastic, it is important to clean the surface thoroughly and create a rough surface for the glue to adhere to by sanding or using steel wool. Always refer to the product's instructions for specific preparation and application techniques.
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Gorilla glue is a versatile, quick-drying option
When it comes to choosing the best adhesive for plastic, there are many options available, each with its own unique advantages and use cases. One versatile and quick-drying option that stands out is Gorilla Glue. Known for its industrial-strength holding power, Gorilla Glue can bond virtually anything, including various types of plastic.
Gorilla Glue offers a range of products suitable for different applications. Their original formula is a polyurethane-based adhesive known for its incredible strength. It can be used on a wide range of materials, including most plastics, with some exceptions. It is important to note that Gorilla Glue is not recommended for use on polypropylene (PP) or polyethylene (PE) plastics or any rubber with high oil or plasticizer content.
To use Gorilla Glue effectively on plastic surfaces, it is essential to follow the recommended preparation steps. All surfaces must be clean, dust-free, and tightly fitting. For shiny surfaces, such as some plastics, it is advisable to roughen the material slightly to provide a better grip for the glue. Additionally, lightly dampening one surface with water can enhance the bonding process.
Gorilla Super Glue, another product in the Gorilla Glue range, is a cyanoacrylate adhesive designed for high performance and quick repairs. It is formulated to bond a wide range of materials, including most plastics, metals, elastomers, wood, and porous surfaces. This super glue is particularly useful for smaller repairs that require an instant bond and projects where clamping is not needed.
Overall, Gorilla Glue provides a versatile and quick-drying option for bonding plastics. With its range of products, you can choose the most suitable adhesive for your specific application, ensuring a strong and reliable bond. However, it is always important to refer to the manufacturer's instructions and take the necessary precautions when working with adhesives.
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Frequently asked questions
The best adhesive for plastic depends on the type of plastic you are working with. Some common types of plastic and their compatible adhesives include:
- Polystyrenes (marked with a 6 or "PS"): super glue or poly cement
- Polyvinyl chloride (PVC): irrigation pipe PVC glue
- Polypropylene and polyethylene: two-part syringe epoxy, or industrial adhesives that require more expensive dispensers
If you are unsure of the type of plastic, you can check for a recycling label on the object.
Before gluing, ensure that the surfaces you intend to join are clean and free of dirt or grime. Less is more when it comes to using strong glues – using too much can result in longer drying times and dried glue buildup. If you are gluing plastic that will be exposed to the elements, be sure to use a waterproof glue suitable for outdoor use.
Some examples of strong adhesives for plastic include:
- Gorilla Glue
- Loctite Vinyl, Fabric and Plastic Flexible Adhesive
- OATEY Brand epoxy plumbers putty
- SciGrip Weld-On 16 or Weld-On 3
