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We developed 3M™ Scotch-Weld™ Urethane Adhesive EC-3535 B/A as a fast acting, two-part urethane adhesive which cures at room temperature or with heat to form tough structural bonds with high impact resistance. Our adhesive offers strong adhesion on metals, plastics, composites and many primed or painted metal and plastic substrates. It also becomes non-sag approximately 30 seconds after mixing.
3M™ Scotch-Weld™ Urethane Adhesives EC-3535 B/A creates strong bonds with high impact resistance and is engineered to be sag-resistant approximately 30 seconds after mixing so the adhesive doesn't run, drip or migrate. Its 3-5 minute work-life allows ample time for handling, accurate application and positioning of parts. EC-3535 B/A forms a fast, secure bond between parts for desired results. To help keep your processes moving forward, 3M Scotch-Weld Urethane Adhesive EC-3535 B/A cures in 8 hours at room temperature, or sooner with heat. This option gives you control over the speed in which the bond reaches the shear strength required. And to meet various application methods and other needs, Scotch-Weld™ EC-3535 B/A can be applied using a spatula, trowel or flow equipment.
| Substrate | Test Temperature | ||
|---|---|---|---|
| -40°F (-40°C) | 75°F (24°C) | 180°F (82°C) | |
| Etched Aluminum | 2500 | 2000 | 300 |
| Abraded and Solvent Wiped Aluminum | 2000 | 2000 | 300 |
| Solvent Wiped Aluminum | 1000 | 1000 | 100 |
| Abraded and Solvent Wiped Steel | 2000 | 1200 | 100 |
| Solvent Wiped Steel | 1000 | 700 | 20 |
Urethanes are a class of polymers generally noted for their flexibility when cured. Two part urethane adhesives comprise two independent formulations designed to be mixed, much like an epoxy adhesive. The isocyanate stream, generally the accelerator or hardener side, reacts with the polyol or resin side. These two components will react when mixed, curing more quickly than one-part, moisture cure urethane systems — and with no depth of cure issues.
Urethane adhesives will work on most common materials such as wood, metals, rubbers, cured epoxy, leather, tile and glass, many plastics, concrete and more. The versatility of urethane adhesives comes from its chemical recipe; different chemical combinations result in different properties that produce different levels of stiffness, density, flexibility or hardness. They can cure to a solid and be relatively rigid, or cure to a semi-hardened state and remain flexible to meet a wide range of requirements. In either finished state, urethane adhesives maintain bond strength integrity through variable environmental factors such as temperature, moisture and chemical exposure.
The Benefits of Using a Structural Adhesive
Utilizing a structural adhesive like 3M™ Scotch-Weld™ Urethane Adhesive EC-3535 B/A comes with several advantages, such as:
- Eliminating the need to damage surfaces (i.e. drilling holes)
- Joining dissimilar materials and works well with many surfaces
- Producing aesthetically pleasing results as refinishing steps are not required
- Good environmental and chemical resistance
- Delivers excellent temperature and solvent resistance
- Does not need access to air or moisture to dry and therefore has an unlimited depth of cure
