Description
Weld-On® 31 is a medium-speed, two-part structural acrylic adhesive formulated to bond a wide variety of substrates including metals, plastics, and composites. With a 13–17 minute working time and 30–40 minute fixture time, it provides installers and fabricators more flexibility compared to fast-curing options like Weld-On 30.
Available in a 490ml cartridge, Weld-On 31 is the go-to solution for sign and display fabrication, electrical assemblies, and general industrial bonding where a balance of workability, strength, and durability is required.
Key Features & Benefits
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Medium-Speed Cure – 13–17 minutes working time, 30–40 minutes fixture time.
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High Bond Strength – Up to 2,400–2,800 psi lap shear on metals.
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Primerless Metal Bonding – Bonds aluminum, CRS, stainless steel, and coated metals without primers.
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Gap-Filling Capability – Ideal for irregular substrates and composite laminates.
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Durability in Harsh Environments – Resistant to impact, fatigue, corrosion, and chemicals.
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Non-Sag Formula – Applies easily to vertical and overhead joints.
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Temperature Resistance – Maintains strength from -40°F to 180°F (-40°C to 82°C).
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UL 746C Approved – Certified for indoor and outdoor electrical signage applications.
Common Applications
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Sign and display fabrication (medium open time for larger assemblies)
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Electrical signage assemblies requiring UL 746C certification
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Bonding aluminum, CRS, stainless steel, painted/coated metals
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Adhesion to plastics such as PVC, ABS, acrylic (PMMA), polycarbonate
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Bonding thermoset composites including epoxy, polyester, and vinyl ester matrices
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Industrial manufacturing where controlled working time is required
Technical Specifications
| Property | Value |
|---|---|
| Color | Off White |
| Mix Ratio (by volume) | 10:1 |
| Working Time | 13–17 minutes |
| Fixture Time (80% strength) | 30–40 minutes |
| Ultimate Bond Strength | 24 hours |
| Lap Shear Strength (Aluminum) | 2,400 psi (16.5 MPa) |
| Lap Shear Strength (Cold Rolled Steel) | 2,550 psi (17.6 MPa) |
| Lap Shear Strength (Stainless Steel) | 2,150 psi (14.8 MPa) |
| Lap Shear Strength (Carbon Fiber – Epoxy) | 2,800 psi (19.3 MPa) |
| Service Temperature | -40°F to 180°F (-40°C to 82°C) |
| Shelf Life | 6 months |
Packaging & Ordering Info
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490ml Cartridge
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Case Quantity: 12
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Stock #: 31125
Dispensing guns and mixing tips available separately.
Call to Action
For sign and display projects that require more working time without sacrificing bond strength, trust Weld-On® 31. Available in the 490ml cartridge for production-scale use.
📞 Call (800) 220-1966 or request a quote online.
👉 Discover more in our Structural Acrylic Adhesives Collection.
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