Maya Ellison
Polyethylene (PE) and Polypropylene (PP) are two types of plastic that are notoriously difficult to bond. This is due to their low surface energy, which causes standard adhesives to bead up on the surface instead of penetrating it. However, advances in adhesive technology have resulted in the development of specialty adhesives designed specifically for bonding these challenging materials. These adhesives are typically two-part formulas that require a cartridge gun and static mixer for dispensing. They offer strong, permanent bonds with high resistance to temperature and chemicals. Some recommended products include the Infinity Bond MMA 500, Loctite acrylic adhesive, Tecbond 267, and Permabond TA46XX range.
| Characteristics | Values |
|---|---|
| Bonding method | Adhesives |
| Common adhesives | Epoxy |
| Common adhesives work? | No |
| Surface preparation | Flame treatment, plasma treatment |
| Adhesive types | Methacrylate MMA adhesives, Hot melt adhesives, Polyethylene and polypropylene glues, Acrylic adhesives, Structural adhesives |
| Adhesive brand names | Infinity Bond MMA 500, Loctite, Sci-Grip 400 LSE, Tecbond 267, Permabond TA46XX, JB weld |
| Adhesive features | Permanent bond, strong, temperature resistant, fast cure speed, cost-effective, non-flammable, high resistance to extreme temperatures, non-hazardous, easy to dispense |
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What You'll Learn
Infinity Bond MMA 500
Polypropylene (PP) and polyethylene (PE) are two of the most difficult plastics to bond. Common adhesives do not work on these plastics, and epoxy does not adhere to them. However, Infinity Bond MMA 500 is a unique two-part adhesive that can bond these difficult plastics.
MMA adhesives offer good chemical and environmental resistance, and fast cure speed. MMAs have higher peel strength and are more temperature resistant. They develop strength faster, allowing parts to be used sooner.
While Infinity Bond MMA 500 is a great adhesive for bonding polyethylene and polypropylene, it may not be the best choice for your specific application. It is always recommended to test the adhesive with your substrate beforehand. Manufacturing can vary from product to product, and success will depend on your substrates and your expectations from the bond.
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Permabond TA46XX range
Polypropylene and polyethylene are two types of plastics that are notoriously difficult to bond with adhesives. This is due to their low surface energy, which causes most adhesives to bead up on the surface instead of penetrating it.
Permabond's TA46XX adhesive range is a popular choice for bonding low surface energy plastics such as polypropylene and polyethylene. The range was specifically designed for hard-to-bond plastics and has excellent adhesion properties. In addition to bonding polypropylene and polyethylene, the TA46XX range can also be used on other challenging plastics like PTFE, as well as rubber, PET, PEEK, and acetal (POM).
The TA46XX range offers several advantages over other adhesives. One key benefit is that it does not require any surface preparation or pre-treatment of the materials before bonding, which simplifies the application process. The adhesives also have excellent environmental durability, including good water resistance, and can be spread over large areas. They are suitable for bonding a wide range of materials, including metals, composites, wood, concrete, and even tarmac, making them very versatile.
One specific product in the TA46XX range is TA4631, which is ideal for bonding PET as it forms a clear thin bond line. This product also has low odour, which can improve worker comfort during application.
Overall, the Permabond TA46XX range provides a strong and versatile solution for bonding low surface energy plastics like polypropylene and polyethylene, offering ease of use and excellent adhesion across a variety of applications.
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Tecbond 267
Polypropylene (PP) and polyethylene (PE) are notoriously difficult materials to bond. Common adhesives do not work on these low surface energy plastics, and epoxy does not adhere to them. However, Tecbond 267 is a hot melt adhesive that can bond both PP and PE.
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JB Weld two-part adhesive
Polypropylene (PP) and polyethylene (PE) are notoriously difficult plastics to bond. Common adhesives do not work, and the plastic's low surface energy makes it challenging for adhesives to penetrate the surface.
JB Weld is a two-part epoxy system that provides strong, lasting repairs to metal and multiple surfaces. It can be used on plastic, composite, PVC, and many other materials. It is mixed at a ratio of 1:1 and forms a permanent dark grey bond that can be shaped, tapped, filed, sanded, and drilled. It sets in 4-6 hours at room temperature and can withstand temperatures of up to 550ºF when fully cured.
To use JB Weld, start by cleaning the surface area of dirt, grease, oil, paint, or loose debris. For best results, use a detergent or degreaser to clean the surface, then roughen it with a file or coarse sandpaper. Next, squeeze equal parts from each tube onto a disposable surface and mix thoroughly. Apply with an appropriate tool in an even coat, weld bead, or extruded shape as needed.
While JB Weld is a versatile adhesive, it is not clear if it can effectively bond polyethylene and polypropylene. For these challenging plastics, specialty adhesives like Infinity Bond MMA 500, Loctite AA 3035 Acrylic Adhesive, and Sci-Grip methacrylate adhesives are recommended. These adhesives are designed for low surface energy plastics and offer strong, permanent bonds.
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Loctite acrylic adhesive
Polyethylene (PE) and Polypropylene (PP) are notoriously difficult materials to bond. Common adhesives do not work on these low surface energy plastics, and the adhesives tend to bead up on the surface instead of penetrating it. However, Loctite offers an acrylic adhesive that can bond these two plastics together.
Loctite's acrylic adhesive 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.
The Loctite Super Glue Plastics Bonding System is a two-part cyanoacrylate adhesive that sets in seconds, dries transparent, and successfully bonds plastics with no mixing or clamping required. It is highly resistant to water, most chemicals, and even freezing temperatures. It delivers tremendous strength in just a single drop.
Loctite AA 3035 Acrylic Adhesive is another product offered by Loctite for bonding plastics. While it may not be the best choice for your particular application, it is still a viable option for creating strong, permanent bonds with polyethylene and polypropylene plastics.
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Frequently asked questions
There are a few products that can be used to bond polyethylene and polypropylene plastics, including Tecbond 267, Tec7 Glue, Mount and Seal, and Superbond Super Glue. Infinity Bond MMA 500 is also a good option and is specifically designed to work on low surface energy plastics.
Polyethylene and polypropylene plastics are non-porous and have low surface energy, making it difficult for adhesives to penetrate the surface and form a strong bond.
When selecting a glue for your project, it's important to consider the materials being bonded, the strength and durability required, the environment the bond will be exposed to, and the ease of application.
Certain surfaces can be pre-treated with techniques such as flame and plasma treatments. Some adhesives, such as the Infinity Bond MMA 500, require a cartridge glue gun and static mixer nozzle for proper dispensing.
