Description
Plexus® MA420 (AO420) is a two-part methyl methacrylate (MMA) adhesive designed for bonding thermoplastics, composites, and metals. With a 10:1 mix ratio, this rapid-curing system is widely recognized as the industry standard for composite bonding in transportation, marine, and industrial manufacturing.
Available under both names — Plexus MA420 and Plexus AO420 — this adhesive delivers a unique combination of fatigue endurance, impact resistance, and superior toughness while requiring virtually no surface preparation.
Key Features & Benefits
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Fast cure system – 4–6 minute working time, 15–22 minute fixture time
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High structural strength – Lap shear up to 2,430–2,970 psi
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Durable under stress – Withstands vibration, fatigue, and dynamic loads
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Minimal to no prep required – Effective on metals, plastics, and composites
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Non-sag thixotropic gel – Suitable for vertical and overhead applications
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Multiple colors – Cream, Black, or Blue for production flexibility
Common Applications
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Bus, truck, and rail body panel bonding
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Marine hull-to-deck and composite assembly
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Industrial signage and enclosure fabrication
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OEM applications in plastics and composites
Technical Specifications
| Property | Value |
|---|---|
| Mix Ratio (Volume) | 10:1 |
| Working Time | 4–6 minutes |
| Fixture Time | 15–22 minutes |
| Tensile Strength | 2,430–2,970 psi (16.8–20.5 MPa) |
| Elongation at Break | 20–40% |
| Tensile Modulus | 149–201 ksi (1,026–1,388 MPa) |
| Gap Fill Capability | Up to 0.375 in (9.5 mm) |
| Shore D Hardness | 73 |
| Service Temperature | -40°F to 180°F (-40°C to 82°C) |
| Shelf Life | 7–10 months depending on color |
Compliance & Certifications
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Manufactured under ISO 9001 and ISO 14001 quality systems
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REACH registered where applicable
Compatible Substrates
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Plastics: ABS, acrylics, polycarbonate, rigid PVC, TPUs
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Composites: FRP, DCPD, epoxy-based composites, gelcoat
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Metals: Aluminum, stainless steel, raw steel, powder-coated and e-coated metals
Packaging & Ordering Information
Chemical Concepts stocks Plexus MA420 (AO420) in multiple sizes:
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490 ml cartridges – Cream, Black, Blue
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5-gallon adhesive pails (Part A)
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5-gallon activator pails (Part B) – Cream, Black, Blue
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50-gallon adhesive drums (Part A)
Compatible with ITW-approved manual and pneumatic dispensers and static mixing nozzles.
Why Choose Plexus MA420 (AO420)?
Whether listed as MA420 or AO420, this adhesive provides fast assembly, reliable strength, and superior durability. Its broad compatibility and low prep requirements reduce labor and improve throughput, making it the trusted choice across transportation, marine, signage, and industrial OEM manufacturing.
For ordering assistance, bulk pricing, or technical support, contact our team at [email protected] or call 800-220-1966.
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