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Plexus® MA550 Two-part Methacrylate Adhesive

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Plexus® MA550 is a high-performance two-part methacrylate adhesive designed for structural bonding of thermoplastics, metals, and composites. Mixed at a 10:1 ratio, MA550 offers a working time of 40-50 minutes, achieving 75% of its ultimate strength in 70-75 minutes at 23˚C (74˚F). This adhesive is ideal for secondary bonding in the marine industry, requiring minimal surface preparation. With excellent fatigue endurance, impact resistance, and toughness, MA550 is bright white and UV stable. Available in 490 ml cartridges, 20-liter pails, and 200-liter drums, it dispenses as a non-sagging gel.

Key Features:

  • 40-50 minute working time
  • White and UV stable
  • Fast, consistent strength development at room temperature
  • High elongation and stress distribution

Key Substrates:

  • Composites: DCPD, FRP, Gelcoat, Phenolics, Epoxy Composites, RIM
  • Thermoplastics: ABS, Acrylics, PBT, Polycarbonate, Rigid PVC, TPUs
  • Coated Metals: Powder-coated, E-coated Metals
  • Raw Metals: Aluminum, Stainless Steel, Raw Steel
Typical Uncured Properties Part A Part B
Color Off-White White
Mix Ratio by Volume 10 1
Mix Ratio by Weight 6.55 1.0
Component Density, g/ml 0.94 1.51
Component Viscosity, cP x1000 130 – 160 30 – 70
VOC’s during cure, % < 1
Shelf Life, Months 10

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