Pre-Coated Fin Stock (Blue Fin, Gold Fin)
Suitable for
- Suitable: Mild sites where fin faces are the main concern
- Suitable: Hydrophilic fin for condensate run-off on evaporators
- Suitable: A base layer under a post-fabrication coating
Not suitable for
- Not suitable: Coastal sites within a few kilometres of the sea on its own
- Not suitable: Protecting copper tubes, return bends and brazed joints
- Not suitable: Industrial or chemical exposure
Matches these environments
Where pre-coated fin falls short
Fins are stamped from coated aluminium coil. Every stamping operation cuts through the coating, and the collars that grip the tubes are formed after coating, so the edges and collars — exactly where copper and aluminium meet — end up with little or no protection. The copper tubes, hairpins and brazed joints were never coated.
On a coastal site that is where corrosion starts: at the fin collars and cut edges, not on the flat fin faces.
When it is enough
On mild inland sites, pre-coated fin is a reasonable baseline, and hydrophilic fin helps condensate drain from evaporators. Near the sea, or where industry adds acid gases, the whole coil needs a coating applied after it is built.
What do the colours mean?
Blue and gold usually indicate the coating type and supplier of the fin stock, such as hydrophilic or epoxy-based layers. The colour itself does not tell you the corrosion resistance.
Can a coil with gold fin be coated again after assembly?
Yes. A post-fabrication coating covers the cut edges, collars, tubes and joints that pre-coated fin leaves exposed.
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