• Item Name: Plexus® AO420 / MA420
• Manufacturer: ITW Performance Polymers
• Technologies: Two-part methacrylate structural adhesive
• Color: Off-white, amber, blue, or black
• Cure Type: Ambient temperature (rapid-curing)
• Package Size: 400-ml cartridge, 20-liter pail (5-gal), 200-liter drum (50-gal)
• Shelf Life: 7–10 months
Plexus® AO/MA420 is a two-part methacrylate adhesive formulated for the structural bonding of thermoplastics, metals, and composites. It is supplied as a non-sagging gel in cartridges, pails, or drums, with a 10:1 mix ratio.
Key Features & Benefits:
Rapid-curing system with excellent toughness, fatigue endurance, and impact resistance.
Requires minimal surface preparation, making it the standard choice for transportation composite bonding.
Available in amber, blue, or black.
Shelf life: 7–10 months (depending on storage).
Service temperature performance shown in strength retention vs. temperature profile.
Resistant to hydrocarbons, acids/bases (pH 3–10), and salt solutions; less resistant to strong polar solvents, strong acids, and bases.
Transportation industry: bonding composites and metals in buses, trucks, and rail applications.
General structural bonding: thermoplastics, coated metals, and composites.
Situations requiring high fatigue endurance and toughness.
Applied via cartridges or automatic meter/mix/dispense equipment.
| Property | Part A | Part B |
|---|---|---|
| Color | Off White | Off White, Blue, Black |
| Density (g/ml) | 0.97 | 1.05 |
| Viscosity (cP × 1000) | 100 – 125 | 35 – 80 |
| Mix Ratio by Volume | 10 | 1 |
| Mix Ratio by Weight | 9.00 | 1.00 |
| VOCs during Cure (%) | < 2 | – |
| Shelf Life (months) | 10 (7 in black) | – |
| Property | Value | Notes |
|---|---|---|
| Hardness | Shore D 73 | – |
| Tensile Strength | 2,430 – 2,970 psi (16.8 – 20.5 MPa) | ASTM D638 / ISO 527 |
| Tensile Modulus | 149 – 201 kpsi (1,026 – 1,388 MPa) | – |
| Elongation at Break | 20 – 40 % | – |
| Peak Exotherm Temp (10 g) | ~240°F (115°C) | – |
| Peak Exo Time (10 g) | 8 – 11 min | – |
| Gap Tolerance | 0.03 – 0.375 in (0.75 – 9.5 mm) | – |
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