What Is an E-Coated Coil?

An e-coated coil has been dipped and electrically charged so an epoxy coating deposits in a uniform film across the entire coil, including the interior fin surfaces a sprayed coating cannot reach. The coating acts as a barrier between corrosive deposits and the metal beneath.

Also called: e-coat · epoxy coated coil · electrodeposition coating

Why it matters to you

Uniform coverage is the point. Salt reaches the inner fin surfaces that air passes through, so a treatment that only covers the outside leaves the vulnerable area exposed. The trade-off is a small reduction in heat transfer, which is accounted for in the equipment's rating.

What to do about it

If a quote offers a coated coil, ask whether it is an e-coat applied to the finished coil or a sprayed treatment, and whether the coating is covered under the equipment warranty. Avoid abrasive cleaning on a coated coil — it defeats the barrier.