Applications

Plexus® MA300

Brand: Plexus®

Package Sizes:

  • Cartridges:
    • 50 mL Cartridge
    • 400 mL Cartridge
  • Bulk Containers:
    • 5-Gallon (20 L) Pails
    • 50-Gallon (200 L) Drums

Shelf Life: 13 months

Product Description

Plexus® MA300 is a two-part methacrylate adhesive designed for structural bonding of thermoplastics, metals, and composite assemblies. It has a 1:1 mix ratio by volume, a work life of 3 to 6 minutes, and reaches handling strength (500 psi) in 11 to 13 minutes at 75°F (23.9°C). The product is supplied in ready-to-use cartridges and bulk packaging and dispenses as a non-sagging gel.


Key Features

  • Fast Cure: Achieves handling strength in approximately 11-13 minutes.
  • High Strength & Toughness: Strong bonds on metals, composites, and thermoplastics.
  • Wide Material Compatibility: Bonds aluminum, stainless steel, ABS, acrylic, PVC, fiberglass, and more.
  • Minimal Surface Preparation: Bonds many materials without extensive surface prep.
  • Excellent Impact Resistance: Durable under dynamic loads.

Recommended Applications

  • Transportation: Bonding composite and metal components in automotive, marine, and aerospace.
  • Construction: Structural bonding of composite and thermoplastic panels.
  • Industrial Equipment: Bonding metals and plastics in general manufacturing.
  • Sporting Goods: Used in assembly of lightweight and impact-resistant components.

Typical Uncured Physical Properties

Property Value
Color Part A: Beige, Part B: Off-White
Viscosity 40,000 – 70,000 cP
Density 1.00 – 0.96 g/mL
Mix Ratio (by volume/weight) 1:1
Work Life 3 – 6 minutes at 75°F (23.9°C)
Time to 50 psi (0.3 MPa) 11 – 13 minutes
Time to 500 psi (3.4 MPa) 15 – 17 minutes
Time to 1000 psi (6.9 MPa) 19 – 22 minutes

Typical Cured Physical Properties

Property Value
Color Off-White
Shore D Hardness 78
Elongation at Break 20 – 40%
Tensile Strength 3,510 – 4,290 psi (24.2 – 29.6 MPa)
Tensile Modulus 221 – 299 kpsi (1,524 – 2,062 MPa)
VOC Content < 1%
Gap Tolerance 0.01 – 0.125 in (0.25 – 3.2 mm)

Performance Characteristics

Overlap Shear Strength (ASTM D1002, Typical Values)

Substrate Lap Shear Strength (psi/MPa) Failure Mode
Aluminum 3,155 psi (21.8 MPa) Adhesive Failure (AF)
Stainless Steel 3,343 psi (23.1 MPa) Cohesive Failure (CF)
PVC 1,391 psi (9.6 MPa) Substrate Failure (SF)
Polycarbonate (PC/ABS) 578 psi Substrate Failure (SF)
Gel Coat 578 psi Fiber Tear (FT)

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