Description
Plexus MA300 is a two-component methacrylate adhesive formulated for structural bonding of thermoplastics, metals, and composite materials. With a convenient 1:1 mix ratio, it gels in 3–6 minutes and develops rapid strength (500 psi in ~11–13 min, 1,000 psi in ~13–16 min at 74 °F / 23 °C). Supplied as a non‑sag thixotropic gel, MA300 provides precise application in vertical or overhead joints.
Key Features & Benefits
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Medium working time: 3–6 minutes at ambient temperature
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Accurate 1:1 mix ratio: simplifies dispensing and minimizes waste
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Rapid strength build-up: reaches structural holding strength in minutes
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High toughness and stiffness: capable of high-load structural bonding
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Non‑sag gel consistency: easy to apply in vertical or overhead positions
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Wide substrate compatibility: bonds unprimed plastics, coated and raw metals, and composites
Common Applications
Ideal for bonding in:
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Transportation assemblies (automotive, RV, marine)
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Composite reinforcement and panel bonding
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Thermoplastic joining (ABS, acrylic, polycarbonate, PBT, Rigid PVC, TPU)
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Adhesion to coated or powder-coated metals and raw aluminum or steel
Technical Specifications
| Property | Value |
|---|---|
| Mix Ratio | 1:1 volume & weight |
| Working Time @ 23 °C | 3–6 min |
| Time to 500 psi | ~11–13 min |
| Time to 1,000 psi | ~13–16 min |
| Lap Shear Strength | 3,000–3,800 psi (20.7–26.2 MPa) |
| Tensile Strength | 3,500–4,300 psi (24–29 MPa) |
| Elongation | 5–15 % |
| Viscosity (part A & B) | 40,000–70,000 cP |
| Operating Temperature Range | –67 °F to 250 °F (–55 °C to 121 °C) |
| Gap Fill | up to ~0.125 in (≈3.2 mm) |
| Shelf Life | 12–13 months |
| Flash Point | ~51 °F (11 °C) |
| Chemical Resistance | Excellent to hydrocarbons, salts, acids/bases pH 3–10 |
Compliance & Certifications
Manufactured by ITW Performance Polymers, an ISO 9001 and ISO 14001 certified facility.
Compatible Substrates
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Thermoplastics: ABS, acrylics, polycarbonate, PBT, TPU, rigid PVC
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Composites: DCPD, FRP, gelcoat, phenolic, epoxy-based composites, RIM
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Metals: Bare aluminum, raw steel, stainless steel, powder- or E-coated surfaces
Packaging & Ordering
Available in:
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Cartridges: 25 ml (cream), 50 ml (cream or black), 400 ml (cream or black)
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Bulk: 5‑gallon (20 L) pails and 50‑gallon (200 L) drums
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See ITW stock numbers (e.g., 30500, 30000, IT405–IT408) for bulk & cartridge variants.
Volume discounts available; contact Chemical Concepts for pricing and lead time.
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