• Item Name: Plexus® MA8120
• Manufacturer: ITW Performance Polymers
• Technologies: Two-part methacrylate structural adhesive
• Color: Off-white (Part A), Gray (Part B)
• Cure Type: Room temperature curing (exothermic reaction)
• Package Size: 400 ml cartridge, 20 L pail, 200 L drum
• Shelf Life: 12 months
Plexus® MA8120 is an advanced, direct-to-metal, low-halogen, two-part methacrylate structural adhesive. It is specifically engineered for bonding metals, composites, and engineered thermoplastics with minimal surface preparation. Supplied as a 1:1 mix ratio non-sagging gel, MA8120 offers a unique combination of high strength, toughness, and fatigue resistance, with superior thin film cure.
Key Features & Benefits:
Bonds galvanized and zinc-treated steel, aluminum, stainless steel, composites, PVC, polyester, and gel coats.
Excellent balance of strength, toughness, and fatigue resistance.
Low halogen content, suitable for sensitive applications.
Good chemical resistance (hydrocarbons, acids/bases pH 3–10, salt solutions).
Service temperature: continuous up to 250°F (121°C), intermittent higher.
Shelf life: 12 months (stored 13–25°C).
Available in 400-ml cartridges, 5-gal pails, or 50-gal drums.
Structural bonding of metals, plastics, and composites in transportation, marine, industrial, and construction sectors.
Direct-to-metal bonding with little to no surface preparation.
Large-scale assembly with bulk dispensing equipment.
| Property | Part A | Part B |
|---|---|---|
| Color | Off-White | Gray |
| Viscosity (cP ×1000) | 40 – 80 | 80 – 120 |
| Density (g/ml) | 0.97 | 0.96 |
| Mix Ratio by Volume | 1.00 | 1.00 |
| Mix Ratio by Weight | 1.01 | 1.00 |
| VOC during cure (%) | <1 | – |
| Shelf Life (months) | 12 | 12 |
| Property | Value | Method / Notes |
|---|---|---|
| Tensile Strength | 3,100 – 3,500 psi (21.4 – 24.1 MPa) | ASTM D638 |
| Tensile Modulus | 175 – 195 kpsi (1,207 – 1,345 MPa) | ASTM D638 |
| Elongation at Break | 45 – 55 % | ASTM D638 |
| Hardness | Shore D 70 | ASTM D2240 |
| Peak Exotherm (10 g) | ~275°F (135°C) | – |
| Peak Exo Time (10 g) | 35 – 40 min | – |
| Time to 50 psi (0.3 MPa) | 40 – 75 min (temp dependent) | Lap shear AL6061 |
| Time to 500 psi (3.4 MPa) | 60 – 95 min | – |
| Time to 1000 psi (6.9 MPa) | 55 – 125 min | – |
| Time to 90% Cure | ~5 h | – |
| Temperature Resistance | Continuous 250°F (121°C), intermittent higher | – |
| Lap Shear Strength (ASTM D1002, AL6061) | 2,416–2,656 psi (16.7–18.3 MPa), Cohesive Failure | – |
| Substrate Lap Shear (typical) | Steel: 2,445 psi (16.9 MPa, CF); SS304: 2,647 psi (18.3 MPa, CF); Gel coat: 1,958 psi (13.5 MPa, FT); PVC: 1,184 psi; DCPD: 1,290 psi (8.9 MPa, CF/SF) | ASTM D1002 |
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