Heresite P413 - Anticorrosion protection of coils for special applications with baked phenolics

Heresite - Anticorrosion protection of coils for special applications with baked phenolics

ANTICORROSION COATING OF FINNED PACK HEAT EXCHANGERS AND MICROCHANNEL HEAT EXCHANGERS WITH THERMOSETTING MODIFIED PHENOLIC COATING HERESITE P413 – REVISION 6, DATED 06/11/2017

Please find below the technical description for the application on finned pack heat exchangers and microchannel heat exchangers of the recently released new version of Heresite P413, a self-priming, thermosetting modified phenolic coating with high corrosion resistance and chemical inertia even if applied at low thickness (target thickness on exchange areas is minimum 25 [µm]).

We also take this opportunity to present its repair kit, named Heresite VR-554T Brown.

A. HERESITE P413 SYSTEM DESCRIPTION:

• Cleaning of surfaces to be coated with hot water and cleaning agent;
• Rinsing with sweet water to remove cleaning agent;
• Removal of residues of water with compressed air;
• Drying in oven at temperature up to 190°C;
• Fins alignment to facilitate product application (if necessary);
• Supply and application of Heresite P413 to a dry film thickness of 10-15 [µm];
• Pre-polymerization in oven for minimum 15 minutes at 90°C;
• Supply and application of Heresite P413 to a dry film thickness of 10-15 [µm];
• Pre-polymerization in oven for minimum 15 minutes at 90°C;
• Supply and application of Heresite P413 to a dry film thickness of 10-15 [µm];
• Pre-polymerization in oven for minimum 15 minutes at 90°C;
• Inspection prior to final polymerization;
• Final polymerization in oven for minimum 45 minutes at 190°C.

Notes:

• Optional UV Protection: supply and application of one layer of polyurethane topcoat of RAL 8002 (Signal Brown) or other to be agreed on a project by project basis and dry film thickness of 50-75 [µm];
• CuCu coils only: additional dry cleaning with baking soda at low pressure and special equipment is used and followed by additional rinsing and drying in oven.

B. REPAIR KIT:

• Heresite P413 requires a final polymerization at 190°C and thus it is not suitable for touch-ups;
• For this purpose, Heresite suggests VR-554T Brown, an air dry phenolic resin bottles in handy spray-cans that are ready for use;
• Heresite VR-554T Brown offers a good corrosion resistance and a finish color close to that of Heresite P413.