• Item Name: Plexus® MA550
• Manufacturer: ITW Performance Polymers
• Technologies: Methacrylate adhesive (two-part, 10:1 ratio)
• Color: Bright White (Part A: Off-White, Part B: White)
• Cure Type: Ambient temperature
• Package Size: 490-ml cartridges, 20-liter pails, 200-liter drums
• Shelf Life: 10 months
Plexus® MA550 is a two-part methacrylate adhesive (10:1 mix ratio) formulated for structural bonding of thermoplastics, metals, and composites. It offers a working time of 40–50 minutes at 23°C and reaches ~75% of ultimate strength within 70–75 minutes.
Key Features & Benefits:
Requires minimal to no surface preparation.
Excellent fatigue endurance, impact resistance, and toughness.
Bright white, UV stable.
Supplied in cartridges, pails, and drums as a non-sagging gel.
Shelf life: 10 months (13–25°C).
Widely used in marine industry for secondary bonding applications.
Suitable for bonding thermoplastics, coated or raw metals, and composites.
Compatible with manual (cartridges) or bulk dispensing systems.
| Property | Part A | Part B |
|---|---|---|
| Color | Off-White | White |
| Mix Ratio by Volume | 10 | 1 |
| Mix Ratio by Weight | 6.55 | 1.0 |
| Density (g/ml) | 0.94 | 1.51 |
| Viscosity (cP ×1000) | 130 – 160 | 30 – 70 |
| VOC during cure (%) | < 1 | – |
| Shelf Life (months) | 10 | 10 |
| Property | Value | Method / Notes |
|---|---|---|
| Tensile Strength | 2,175 – 2,374 psi (14.9 – 16.4 MPa) | ASTM D638 / ISO 527 |
| Tensile Modulus | 56 – 80 kpsi (386 – 551 MPa) | ASTM D638 / ISO 527 |
| Elongation at Break | 20 – 40 % | ASTM D638 / ISO 527 |
| Hardness | Shore D 70 | ASTM D2240 |
| Gap Tolerance | 0.03 – 0.375 in (0.75 – 10 mm) | – |
| Peak Exotherm Temp (10 g) | 215°F (101°C) | – |
| Peak Exotherm Time (10 g) | 65 – 70 min | – |
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