Introduction

In the world of recreational marine, design, performance and durability are everything. Whether you’re building a luxury yacht, jet skis or a speed boat, choosing the right materials, sealants and structural adhesives are crucial for a successful quality build.

The use of carbon fiber reinforced polymers (CFRP) and carbon fiber wraps continue to grow in the boatbuilding industry due to their high strength-to-weight ratio, durability, resistance to corrosion, and the sleek aesthetics they bring. But to get the most out of carbon fiber components, reliable bonding methods are essential. This blog discusses how Plexus^® structural acrylic adhesives can successfully be used. 

Why Use Plexus Adhesives for Bonding Carbon Fiber

Plexus adhesives are high performing MMA structural adhesives, known for their excellent adhesion to a variety of substrates including composite materials like CFRPs, thermoplastics and metals. Unlike traditional mechanical fasteners, Plexus adhesives provide even stress distribution over the joint area and excellent fatigue resistance. Both, essential in marine environments where bonded components are subject to constant vibration, impacts and dynamic loads. Bonding in composites (structures), general composites materials, or sheets of carbon fiber composites, bring peace of mind when using the Plexus brand of adhesives.

For applications involving the bonding of carbon fiber plates, pre-preg carbon fiber or sheets of thermoplastic carbon fiber panels, Plexus adhesives offer a strong, lasting bond without the need to compromise structural integrity. Within the Plexus technology range, there are a variety of curing times that provide many desired physical properties and resistance to many environmental exposures, including, saltwater. This makes Plexus adhesives an ideal solution for marine use.

Certified for Marine-Grade Structural Bonding

Plexus adhesives aren’t just high performing: they have also been long recognized by organizations such as the official Italian Register (RINA) and the American Boatbuilders Association (ABA) according to their Rules for the Classification of Yachts. ITW Performance Polymers is pleased to announce that Plexus products MA420, MA425, MA530, MA560 and MA590, have received RINA certification meaning they are approved for structural bonding of composite materials, including CFRPs, pre-preg carbon fiber, and other composite materials commonly used in boat building.

RINA certification is especially valuable for projects that must comply with classification society requirements. Whether you’re bonding hull components or structural reinforcements, you can be confident that these adhesives meet the highest safety and performance standards.

Applications in Recreational Marine

Plexus adhesives can help in a wide variety of applications. The following are a few examples of common applications Plexus had had historic success. The wide range of versatility of Plexus including the bonding of dissimilar materials, makes the Plexus range of systems an ideal solution for a multitude of applications in composites, plastics, coatings and metals.

·         Composite bonding – Modern boat hulls, interiors, and consoles incorporate bonding composites such as CFRP and other advanced materials. Plexus adhesives provide superior bonding for most composite materials as well as bonding dissimilar materials, such as CFRP to fiberglass.

·         Thermoplastics – Thermoplastics are commonly used in interior panels and dash components. Plexus adhesives provide superior bonding between thermoplastic materials or dissimilar materials, such as the bonding of CFRP to ABS or CFRP to PVC plastics.

·         Metal bonding – Bonding carbon reinforced plastics to metal, whether for roof-top supports, or engine mounting brackets can present unique challenges due to differing thermal expansion rates and surface energies. The properly chosen Plexus products act as a robust metal adhesive, creating strong bonds between CFRP and aluminum, stainless steel, or titanium without the need for primers.

Alternative to Mechanical Fasteners

When working with carbon reinforced plastics, traditional fastening methods can compromise the material’s integrity by introducing stress concentrations or potential leak paths. Plexus adhesives eliminate these issues, providing a clean, efficient alternative that maintains both the appearance and performance of high-end composite builds.

Conclusion

For marine designers, builders professionals and those focused on repair, bonding with Plexus adhesives offers the strength, reliability, and flexibility needed to push design boundaries and efficiency. Whether you’re joining metal to CFRP, installing general reinforced fiberglass parts, or simply gluing ABS interior parts, Plexus is the marine grade solution trusted by industry leaders.

If you have questions on using Plexus structural adhesives, contact our Technical Services team today.

By: Aoibhinn O’Sullivan, Laboratory Technician and Elisabeth Baumann, Technical Services Laboratory Supervisor