Contact adhesives (CR and SBS/SIS based) are indispensable in upholstery, worktops, postforming and assembly because they bond instantly. But if the principle behind their name isn't understood, the results disappoint.
The principle
Contact adhesive is applied to both surfaces. Once the solvent has evaporated, the dry films are pressed together and the rubber chains interlock instantly. That is why parts cannot be repositioned once they touch.
The right sequence
- Surface preparation: surfaces must be clean, dry, dust- and oil-free.
- Application: apply a thin, even film to both surfaces by brush, roller or spray. Porous surfaces may need a second coat.
- Flash-off: let the film dry until it no longer sticks to a knuckle but is still slightly tacky, usually 5–20 minutes depending on temperature and film thickness.
- Joining: align the parts carefully and bring them into contact.
- Pressure: apply brief but high pressure (roller, press or rubber mallet). Bond strength rises with pressure.
Common mistakes
| Mistake | Result |
|---|---|
| Applying to one surface only | Weak or no bond |
| Cutting flash-off short | Trapped solvent, blisters, weak bond |
| Exceeding open time | Film loses tack |
| Too little pressure | Partial contact, edges lifting |
| Film too thick | Slow drying, low strength |
Reactivation
A dry film past its open time can be reactivated with heat (hot air) or a thin solvent coat. Heat activation is standard in postforming.
Greener alternatives
To cut solvent emissions, consider water-based contact adhesives, PU dispersions or PSA hot melts.
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