Description
Plexus MA425 Structural MMA Adhesive – 490ml Cartridge (10:1)
High-Strength Methacrylate Adhesive for Composites, Metal & Plastics
Plexus MA425 is a two-part structural MMA adhesive designed for high-strength bonding of composites, metals and thermoplastics in demanding marine, transport and industrial applications. With its extended working time and exceptional durability, it is ideal for large bonding areas, complex assemblies and precision alignment applications.
Formulated for performance and efficiency, MA425 requires minimal surface preparation, helping reduce labour time while delivering a strong, long-lasting structural bond.
Browse our full range of plexus structural MMA adhesives for bonding plastics, metals and composites across industrial applications. For Permabond MMA adhesives you can view these here.
🔍 What is Plexus MA425 used for?
Plexus MA425 is widely used for composite bonding and structural assembly, particularly where longer working time is required. It is commonly used in:
- Marine fabrication (GRP, fibreglass, gelcoat bonding)
- Transport and vehicle body assembly
- Composite panel bonding
- Industrial equipment manufacturing
- Structural bonding of plastics to metals
For bonding low surface energy plastics or mixed substrates, consider Permabond TA4611 structural adhesive as an alternative MMA solution.
⚙️ Key Features & Benefits
- Extended working time (30–35 minutes) – ideal for larger or complex assemblies
- Fast strength build – ~75% strength in 80–90 minutes
- Exceptional impact and fatigue resistance
- High peel strength and toughness
- Minimal surface preparation required
- Strong adhesion to mixed substrates
- Excellent resistance to hydrocarbons, salt solutions and chemicals
- Non-sag gel formulation for easy application on vertical surfaces
🧱 Designed for Composite & Structural Bonding
Plexus MA425 is particularly suited to bonding:
- GRP / fibreglass
- Gelcoats and vinyl esters
- ABS, acrylics and PVC
- Polyesters (including DCPD modified)
- Aluminium, steel and coated metals
- Thermoplastics and composite panels
🔄 MA425 vs Faster MMA Adhesives (e.g. MA300)
Plexus MA425 is ideal when you need more working time and flexibility during assembly:
- Longer open time for accurate positioning
- Better suited to large bonding areas
- Improved handling for complex builds
- Maintains high structural strength and durability
For faster bonding applications, see Plexus MA300.
📦 Product Details
- Type: Methacrylate (MMA) structural adhesive
- Mix Ratio: 10:1
- Working Time: 30–35 minutes
- Fixture Time: 80–90 minutes
- Colour: Blue (mixed)
- Packaging: 490ml cartridge
- Application: Requires 10:1 dispensing gun and static mixer
🛠 Why Choose Plexus MA425?
Plexus MA425 is trusted across marine, automotive and industrial sectors for its ability to deliver strong, durable bonds with reduced surface preparation. Its extended working time makes it the ideal solution where precision, flexibility and performance are critical.
❓ FAQs
Is Plexus MA425 suitable for composite bonding?
Yes — MA425 is specifically designed for bonding composites such as GRP, fibreglass, vinyl esters and gelcoats.
What makes MA425 different from MA300?
MA425 has a longer working time, making it better suited to larger assemblies or applications requiring more positioning time.
Does Plexus MA425 require surface preparation?
Minimal preparation is typically required compared to epoxy systems, though cleaning is always recommended. For difficult substrates or maximum bond strength, we recommend using an appropriate adhesion primer where required.
For more advice on selecting the right adhesive, visit our technical hub for adhesive selection guides.
