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Why must coatings on plastic surfaces avoid solvents that cause swelling?
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When applying coatings to plastic surfaces, it is essential to avoid solvents that cause swelling of the underlying substrate to maintain the structural integrity and finish of the plastic part.1
If a solvent causes the plastic to swell, it can compromise the surface quality, lead to dimensional instability, or weaken the bond between the coating and the substrate. Because organic solvents used in traditional surface coating processes can interact aggressively with plastic materials, manufacturers often prefer latex dispersion paints. While these water-based systems are safer for the substrate, they typically require specific surface treatments to ensure proper adhesion.1