Epoxy vs Polyurethane Coil Coatings
Epoxy vs polyurethane
| Epoxy | Polyurethane | |
|---|---|---|
| Chemical resistance | High, particularly to alkalis and solvents. | Good, generally lower than epoxy. |
| UV resistance | Poor — surfaces chalk and fade in sunlight. | Good — retains gloss and colour. |
| Adhesion | Excellent on prepared metal. | Good. |
| Flexibility | Harder and more brittle. | More flexible; tolerates thermal cycling. |
| On coils | Often used as thick films; heat-transfer impact must be checked. | Often combined with other chemistries, such as polysiloxane-urethane. |
Choose epoxy if…
- Chemical or wastewater exposure
- Coils shielded from direct sunlight
- A thicker barrier film is acceptable
Choose polyurethane if…
- Coils facing direct sun
- Heat pumps and other units with frequent thermal cycling
- A thinner, flexible film is preferred
Chemistry is not the whole answer
Coil coatings are rarely pure epoxy or pure polyurethane; many are hybrids, or other chemistries such as polysiloxane sol-gels. Film thickness, coverage and cure usually decide performance more than the resin name. Ask for the test results and film thickness, not just the chemistry.
Cost and lead time
Both are widely available. Cost differences come mainly from film thickness and application method rather than from the resin type.
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