Adhesive Bonding
Adhesive bonding uses formulated-to-bond parts made of the same plastic, a different plastic or a non-polymeric substrate. Generally, adhesives produce more consistent and predictable results in joints requiring strength and durability than other joining methods. The wide variety of modern adhesives ensures that you can find an optimum system for your application.
A number of variables must be considered when selecting adhesive bonding materials, including:
- Chemical compatibility with the plastic substrate
- Flexibility/rigidity requirements
- Environmental and temperature requirements, and
- Aesthetics
Generally, two-part epoxy and urethane adhesives impart excellent bond strength for thermoplastic materials. Cyanoacrylate-based adhesive can produce quick bonds. However cyanoacrylates can be aggressive when used with polycarbonate resins, especially if parts have a high level of thermoformed in and/or applied stresses. Additionally, cyanoacrylic adhesive can be brittle. If your part will be subjected to bending loads at the joint, you may want to select a more ductile system.
UV-cured adhesive, excellent for transparent materials such as Makrolon polycarbonate and Bayblend PC/ABS, cure in seconds and typically have high a bond strength . Two-part acrylic adhesives usually show high bond strength. Use care in selecting these adhesives as some of their accelerators can be very aggressive to Makrolon polycarbonate and Bayblend resins.
Prototype test all parts to determine a given adhesive’s suitability.
Note: Safe Adhesive Handling
You must refer to your adhesive supplier’s Material Safety
Data Sheet (MSDS) for health and safety information and appropriate handling
recommendations, including the use of proper protective equipment for any
bonding systems that you use.
