3M™ Scotch-Weld™ Epoxy Adhesive 1751
The 3M™ Scotch-Weld™ Epoxy Adhesive 1751 B/A is a two-part, aluminum-filled structural adhesive designed for high-strength bonding, particularly on metal surfaces. Its paste-like consistency and extended work life make it suitable for applications requiring precise placement and gap filling.
Key Features
- Excellent Metal Adhesion: Formulated for strong bonds on metals, including aluminum and steel.
- Aluminum-Filled: Enhances strength and provides good thermal conductivity.
- Gap Filling: High-viscosity paste effectively fills voids, making it ideal for repairing holes, dents, and cracks in metal.
- Extended Work Life: Offers a 45-minute work life at room temperature, allowing ample time for application and adjustments.
- Room Temperature Cure: Achieves handling strength in 8–12 hours and full cure in 7 days at 23°C (73°F).
Applications
- Repairing holes, dents, and cracks in metal surfaces.
- Bonding metal components in industrial equipment.
- Replacing mechanical fasteners, such as screws and rivets.
- Structural bonding in automotive and aerospace assemblies.
Technical Specifications
- Mix Ratio (B:A) : 3:2 by volume; 2:1 by weight
- Work Life : 45 minutes at 23°C (73°F)
- Handling Strength : 8–12 hours at 23°C (73°F)
- Full Cure Time : 7 days at 23°C (73°F)
- Cured Color : Gray
- Shore D Hardness : 77
- Overlap Shear Strength : Up to 2,400 psi on steel (ASTM D1002)
- Viscosity (Base/Accelerator) : 145 s / 125 s (time to deliver 20g at 50 psi through 0.104" orifice)
- Shelf Life 24 months in unopened containers at 15–27°C (60–80°F)
Handling & Safety
- Surface Preparation: Ensure surfaces are clean, dry, and free from contaminants. For metals, a solvent wipe followed by abrasion and a second solvent wipe is recommended.
- Application: Mix components thoroughly according to the specified ratio. Apply using a spatula, trowel, or appropriate dispensing equipment.
- Ventilation: Use in a well-ventilated area to avoid inhalation of vapors.
- Personal Protective Equipment (PPE): Wear gloves and eye protection to prevent skin and eye contact.
- Storage: Store in a cool, dry place at 15–27°C (60–80°F). Rotate stock on a first-in, first-out basis.
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