Description
UltraLok® 421GB is a medium-set, two-part structural methacrylate adhesive designed for bonding metals, plastics, and composites with excellent strength and durability. Featuring an 8–12 minute open time, it offers installers and assemblers flexibility for proper alignment and positioning.
With built-in glass beads for bondline control and minimal surface preparation required, UltraLok 421GB is an ideal drop-in replacement for ASI MP 55320, 3M™ Scotch-Weld DP8410NS, and SciGrip SG300-15, offering comparable performance at a more economical price.
See It in Action
Key Features and Benefits
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Medium Open Time: 8–12 minutes allows flexible assembly and repositioning
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Glass Beads: Ensure consistent bond thickness and reduce clamp distortion
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High Strength Performance: 2,500–3,500 psi tensile on metal and composites
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Vibration & Weather Resistant: Engineered for real-world environmental stress
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No Surface Prep Required: Bonds through oils and light surface residues
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Tack-Free Finish: Enables clean sanding and secondary operations
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Color Options: Grey, Black, and Natural
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Application Flexibility: Cartridge or bulk dispensing formats
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Made in the USA
Common Applications
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Metal and plastic enclosure bonding
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Equipment and appliance assembly
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Signage and structural panel lamination
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Transportation, trailer, and RV manufacturing
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HVAC ducting and cabinet construction
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Thermoplastic bonding in consumer and industrial products
Technical Specifications
| Property | Value |
|---|---|
| Mix Ratio (by volume) | 10:1 |
| Open/Working Time | 8–12 minutes |
| Fixture Time | 20–30 minutes |
| Tensile Strength | 2,500–3,500 psi |
| Shear Strength | >2,500 psi |
| Temperature Resistance | -40°F to +250°F |
| Gap Fill | Up to 0.25 inches |
| Mixed Viscosity | 70,000–90,000 cps |
| Mixed Density | 8.1 lbs/gal (0.96 g/cc) |
| Available Colors | Grey, Black, Natural |
| Packaging Sizes | 50ml, 250ml, 500ml, pails, drums |
| Shelf Life | 12 months at room temp (77°F) |
| Cure Profile | Room temperature |
| Surface Prep | Not required |
| Flash Point | 51°F (11°C) |
Ultralok 400 Series Comparison Chart
| Product | Open Time | Fixture Time | Recommended Use | Colors | Available Sizes |
|---|---|---|---|---|---|
| Ultralok 420GB | 3–7 min | 9–15 min | Fast assembly, metal & plastic | Grey, Black, Natural | 50ml, 250ml, 500ml, pails, drums |
| Ultralok 421GB | 8–12 min | 20–30 min | Medium cure for positioning | Grey, Black, Natural | 50ml, 250ml, 500ml, pails, drums |
| Ultralok 422GB | 18–24 min | 30–45 min | Large parts, high-temp environments | Grey, Black, Natural | 50ml, 250ml, 500ml, pails, drums |
Compatible Substrates
Metals:
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Aluminum
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Steel
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Stainless steel
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Coated and e-coated metals
Thermosets:
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Fiberglass
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Gel coats
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Epoxies
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Phenolics
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Polyurethanes
Thermoplastics:
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ABS
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PVC
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Acrylic
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Polycarbonate
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Nylon
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PPO
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Styrene
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PBT/PET blends
Packaging and Ordering Info
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Cartridge Sizes: 50ml, 250ml, 500ml
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Bulk Options: 5-gallon pails and 55-gallon drums
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Recommended Mix Tip: MFQX 08-24T (24-element orange/green)
Looking for a faster or slower version?
Contact Us for Bulk Pricing or Technical Support
Call 800-220-1966 or email [email protected] to speak with our team of adhesive experts. We’re here to help you find the best bonding solution for your application.
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