Description
UltraLok® 305 Structural Methacrylate Adhesive is a rapid-curing, two-part MMA adhesive designed for structural bonding of metals, composites, and plastics. Engineered for high-speed assembly lines and repair applications, UltraLok 305 offers exceptional strength, quick handling, and excellent impact resistance.
With a 2–4 minute working time and 6–8 minute fixture, UltraLok 305 is one of the fastest-curing adhesives in the UltraLok 300 Series—ideal for operations where productivity and throughput are critical.
Key Features & Benefits
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Extremely Fast Cure: 2–4 minute working time; 6–8 minute fixture @ 75 °F (24 °C)
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High Strength & Durability: Achieves up to 3,500 psi tensile strength on metal and composite substrates
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Flexible & Impact Resistant: Toughened formulation resists vibration and fatigue
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Versatile Bonding: Excellent adhesion to metals, plastics, and composites
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Minimal Surface Preparation: No priming or sanding needed for most substrates
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Room-Temperature Cure: Fast, reliable results without heat
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Gap Filling: Bonds irregular surfaces up to 0.25 inches (6 mm)
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1:1 Mix Ratio: Easy dispensing through standard cartridges and mix tips
Common Applications
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Sign & Display Fabrication – Rapid bonding of plastics, polycarbonate, and metal frames
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Metal Assembly – Quick replacement for welds or rivets in light fabrication
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Automotive & Marine – Fast, strong repairs for fiberglass, ABS, and sheet metal components
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General Manufacturing – Ideal for fixture assembly, panel bonding, and plastic part repair
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OEM Assembly Lines – Perfect where fast cycle times and repeatable strength are key
Technical Specifications
| Property | Typical Value | Notes / Source |
|---|---|---|
| Mix Ratio | 1:1 (Resin/Activator) | — |
| Working Time | 2–4 min @ 75 °F (24 °C) | |
| Fixture Time | 6–8 min @ 75 °F (24 °C) | |
| Tensile Strength | 2,500–3,500 psi | ASTM D638 |
| Elongation | 15–25% | Typical |
| Gap Fill | Up to 0.25 inch (6 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 @ 77 °F (25 °C) | — |
Chemical Resistance
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Excellent Resistance to: Hydrocarbons, mild acids and bases, vinegar, household foods
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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 methacrylate adhesive
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RoHS compliant formulation
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Non-UV stable (may yellow slightly over time without affecting strength)
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Refer to SDS for detailed handling and safety guidance
Packaging & Ordering Information
Available in multiple cartridge sizes to suit production and repair applications:
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50 ml Cartridge – Compact size for small assemblies or testing
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400 ml Cartridge – Standard production cartridge
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Mini SmartPak (600 ml) – Eco-friendly packaging for efficient dispensing
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XL SmartPak (1200 ml) – Large-volume size for continuous assembly
Compatible with standard 1:1 mix-ratio manual and pneumatic guns and MFQX 08-24T static mixing tips.
Related UltraLok 1:1 Formulations
The UltraLok 300 Series provides a range of fast- and medium-working-time MMA adhesives for different bonding and assembly needs.
| 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 | Quick-setting structural adhesive for fast bonding |
| UltraLok UL305 | 1:1 | 2–4 min | 6–8 min | 15–25% | 3,000+ psi | Rapid-curing version for high-speed production |
| UltraLok UL310 | 1:1 | 8–12 min | 18–25 min | 10–20% | 3,000+ psi | Medium working time; designed for difficult-to-bond surfaces |
| UltraLok UL330 | 1:1 | 18–25 min | 35–50 min | 10–20% | 3,000+ psi | Slower-curing adhesive for extended assembly times |
| 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 a fast-setting adhesive for high-speed assembly?
Contact our bonding experts at 800-220-1966 or [email protected] for recommendations and ordering assistance.
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