Summary

BLUE FIN is a factory-applied anti-corrosion coating for aluminium outdoor heat-exchanger fins. It uses a three-layer system to enhance corrosion resistance while maintaining hydrophilicity, helping the coil shed condensate efficiently and improving durability versus uncoated fins.

Applies to

  • RAC, PAC, and VRF outdoor coils where BLUE FIN is specified

What BLUE FIN is

An aluminium finstock coated with a multi-layer protective system designed to resist corrosion and retain hydrophilic properties for effective water runoff.

Layered structure (functional stack)

  1. Hydrophilic resin layer – Maintains long-lasting hydrophilicity to promote clean water runoff and stable heat exchange.

  2. Blue corrosion-resistant resin layer – The primary barrier against corrosion; the blue tint identifies this layer.

  3. Chromate conversion layer – Surface treatment of the aluminium substrate that further suppresses corrosion initiation.

Expected performance (salt-spray benchmark)

  • Significantly higher corrosion resistance than bare fins.

  • Improved durability compared with single-layer or inorganic-coated fins.

  • Note: Test results are indicative; real-world performance depends on environment, siting, and maintenance.

Scope & limitations

  • The specification applies only to the fin material.

  • Other components (cabinet, fasteners, PCBs, brackets) are not treated under BLUE FIN.

  • BLUE FIN does not make the entire outdoor unit “corrosion-proof”; siting and maintenance still matter.

Deployment guidance

  • Siting: Avoid direct salt spray where possible; consider wind breaks or setback from shorelines.

  • Maintenance: Rinse coils periodically with fresh water (low pressure) to remove salt and dust.

  • Chemicals & cleaning: Avoid harsh alkaline/acid cleaners and high-pressure jets that can erode coatings.

  • Repairs: If fins are bent or damaged, straighten carefully; use approved touch-up where coating is compromised.

Key takeaways

  • BLUE FIN is a three-layer protective system focused on the coil fins.

  • It improves corrosion resistance and helps maintain heat-exchange efficiency through hydrophilicity.

  • Proper siting and routine maintenance remain essential for long-term performance.