Description
UltraLok® 300 Structural Methacrylate Adhesive is a fast-setting, two-part MMA adhesive designed for rapid structural bonding of metals, composites, and plastics. With a working time of just 3–6 minutes and full fixture strength in 10–15 minutes, UltraLok 300 offers exceptional speed and performance for demanding manufacturing environments.
It’s ideal for engineers and fabricators who need a quick, reliable bond without sacrificing strength or flexibility. Perfect for assembly lines, repair work, and production facilities where cycle time and durability matter.
Key Features & Benefits
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Fast Cure Speed: 3–6 minute working time; fixtures in 10–15 minutes @ 75 °F (24 °C)
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Strong Structural Bonds: Delivers up to 3,500 psi tensile strength on metal and composite substrates
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Excellent Versatility: Bonds fiberglass, steel, aluminum, ABS, PVC, acrylic, polycarbonate, and more
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Minimal Surface Prep: No need for grinding or priming in most cases
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Flexible and Impact Resistant: Rubber-toughened formula resists vibration and thermal cycling
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Room-Temperature Cure: No heat required for full strength
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Gap-Filling Performance: Fills uneven surfaces up to 0.375 inches (9.5 mm)
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1:1 Mix Ratio: Easy-to-use cartridge system with standard static mixing tips
Common Applications
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Metal Fabrication: Ideal for joining aluminum and steel parts quickly and cleanly
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Signage & Displays: Perfect for plastic-to-metal and composite bonding in sign assembly
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Automotive & Marine: Used for body panel, trim, and fiberglass component repair
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General Manufacturing: Rapid assembly of brackets, housings, and molded parts
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Composite Fabrication: High-strength bonding of FRP, ABS, and thermoset composites
Technical Specifications
| Property | Typical Value | Notes / Source |
|---|---|---|
| Mix Ratio | 1:1 (Resin/Activator) | — |
| Working Time | 3–6 min @ 75 °F (24 °C) | |
| Fixture Time | 10–15 min @ 75 °F (24 °C) | |
| Tensile Strength | 2,500–3,500 psi | ASTM D638 |
| Elongation | 20–30% | Typical |
| Gap Fill | Up to 0.375 inch (9.5 mm) | |
| Operating Temperature | -60 °F to 250 °F (-50 °C to 120 °C) | |
| Mixed Density | 8.1 lb/gal (0.96 g/cc) | — |
| Color | Translucent Amber | — |
| Shelf Life | 12 months (stored at 77 °F / 25 °C) | — |
Chemical Resistance
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Excellent Resistance to: Hydrocarbons, mild acids & bases, vinegar, and household substances
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Avoid Prolonged Exposure to: Strong acids, strong bases, and polar solvents
Compatible Substrates
Aluminum • Steel • Stainless Steel • Fiberglass • ABS • PVC • Acrylic • Polycarbonate • Phenolics • Polyurethane • Epoxy
Compliance & Safety
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Industrial-grade formulation
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RoHS compliant
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Non-UV stable (may yellow slightly over time without affecting performance)
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Refer to SDS for detailed handling and storage information
Packaging & Ordering Information
Available sizes:
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50 ml Cartridge – Ideal for testing and small assemblies
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400 ml Cartridge – Standard production size
- 600 ml Cartridge – Bulk production cartridge size
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Mini SmartPak (600 ml) – Compact, eco-friendly packaging for reduced waste
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XL SmartPak (1200 ml) – High-volume cartridge for large-scale production
Related UltraLok 1:1 Formulations
The UltraLok 300 Series includes a range of 1:1 MMA adhesives tailored for different cure speeds and applications.
| Product | Mix Ratio | Working Time | Fixture Time | Elongation | Lap Shear Strength | Description |
|---|---|---|---|---|---|---|
| UltraLok UL300 | 1:1 | 3–6 min | 10–15 min | 20–30% | 3,000+ psi | Fast-setting acrylic for quick structural bonding |
| UltraLok UL305 | 1:1 | 2–4 min | 6–8 min | 15–25% | 3,000+ psi | Rapid version of UL300 for even faster cure |
| UltraLok UL310 | 1:1 | 8–12 min | 18–25 min | 10–20% | 3,000+ psi | Medium working time for difficult-to-bond surfaces |
| UltraLok UL330 | 1:1 | 18–25 min | 35–50 min | 10–20% | 3,000+ psi | Slower-curing version of UL310 for larger assemblies |
| UltraLok UL350 | 1:1 | 28–35 min | 60–70 min | 25–40% | 2,500+ psi | Medium-working-time 30-minute structural acrylic |
👉 Shop All UltraLok Structural Adhesives
Need help choosing the right adhesive for your application?
Contact our adhesive specialists at 800-220-1966 or [email protected] for expert recommendations and ordering assistance.
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