Description
LORD® Signlok™ 403 is a fast-curing, high-strength acrylic adhesive designed for bonding a wide range of metals and engineered plastics—ideal for structural sign fabrication, metal framing, and panel bonding. Offering rapid handling strength in just 4–6 minutes, Signlok 403 is perfect for high-throughput assembly environments requiring speed and durability.
As part of the Signlok 210ml cartridge series (which includes Signlok 406, 810, and 7550), it uses the same NEW-3-203-XSP dispensing gun and MCQ 08-24T mixing tip, simplifying setup across multiple jobs and adhesive types.
Key Features & Benefits
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Fast Cure Time: Working time of 2–4 minutes, with handling strength in just 4–6 minutes
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High Mechanical Performance: Lap shear strength of 2,300 psi (steel), peel strength of 20–23 pli (aluminum)
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Temperature Resistance: Reliable bonding from -40°F to +300°F (-40°C to +149°C)
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Glass Bead Reinforcement: Ensures bondline control and minimizes adhesive waste
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Non-Sag Formula: Ideal for vertical or overhead applications
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Environmentally Resistant: Resists weathering, moisture, salt spray, dilute acids, oils, and solvents
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UL 746C Recognized: Approved for sign assemblies per UL File E225855, MH26317
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Long Shelf Life: 18 months in sealed storage below 80°F
Common Applications
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Channel letter assembly
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Sign box and corner key bonding
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Metal frame construction
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ACM and substrate panel installation
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Welding and rivet replacement in signage and architectural applications
Technical Specifications
| Property | Value |
|---|---|
| Work Time | 2–4 minutes |
| Handling Strength | 4–6 minutes |
| Full Cure Time | 24 hours (90% in 2 hours) |
| Mix Ratio | 2:1 |
| Color (Mixed) | Tan |
| Cured Appearance | Tan to green |
| Lap Shear Strength (Steel) | 2,300 psi (15.86 MPa) |
| Peel Strength (Aluminum) | 20–23 pli (3.5–4.0 N/mm) |
| Operating Temperature | -40°F to +300°F (-40°C to +149°C) |
| Shelf Life | 18 months (sealed, <80°F) |
Compliance & Certifications
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UL 746C Recognized (UL File E225855, MH26317)
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Complies with UL 48 and CSA C22.2 standards for electric signs
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Suitable for UL-listed sign cabinet and metal bonding applications
Compatible Substrates
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Aluminum and stainless steel
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Cold-rolled steel
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Aluminum composite materials (ACM)
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PVC foam board, PETG
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Polycarbonate, ABS, acrylics
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Polystyrene foam board
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Vinyl laminate
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Glass (with adhesion promoter)
Packaging & Ordering Info
| Cartridge Size | Part # | Mix Ratio | Dispensing Gun | Mixing Tip |
|---|---|---|---|---|
| 210ml | 3031522 | 2:1 | NEW-3-203-XSP Gun | MCQ 08-24T |
Related Signlok Products (210ml Cartridge Series)
| Product | Work Time | Color | Use Case |
|---|---|---|---|
| Signlok 403 | 2–4 min | Tan | Fast cure for sign and metal bonding |
| Signlok 406 | 6–10 min | Tan | General-purpose structural adhesive |
| Signlok 810 | 8–12 min | Dark Gray | Flexible, low-read-through bonding |
| Signlok 7550 | 3–5 min | Clear | Non-structural bonding for trimcaps |
Technical Support
For help choosing the right Signlok adhesive or setting up dispensing equipment:
Email: [email protected]
Phone: 800-220-1966
Ask about application testing or bulk order pricing for high-volume signage projects.
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