What are the best adhesives for bonding polyethylene to polypropylene?

Bonding polyethylene (PE) to polypropylene (PP) can be challenging due to their low surface energy, which makes them resistant to most adhesives. However, certain specialized adhesives can create strong, durable bonds between these plastics.

1. Cyanoacrylate Adhesives (Super Glue): Fast-curing and effective for small projects, but may not withstand heavy stress or environmental exposure.

2. Epoxy Adhesives: Two-part epoxies with plastic primers provide strong bonds, especially when surface-treated (e.g., flame or corona treatment).

3. Polyurethane Adhesives: Flexible and resistant to impacts, ideal for applications requiring some movement.

4. Acrylic-Based Adhesives: Structural acrylics with primers offer excellent chemical and thermal resistance for industrial use.

5. Specialty Polyolefin Adhesives: Designed specifically for PE and PP, these adhesives often require minimal surface preparation.

For optimal results, clean surfaces thoroughly and consider mechanical abrasion or chemical priming to enhance adhesion. Always test the adhesive on a small area before full application.