Can One Coating Handle Salt and Industrial Pollution Together?
Key facts
| Exposure | Recommended | Note |
|---|---|---|
| Coast plus urban or light industry | PG-S1 | Thin film by dip |
| Port or coastal industrial zone | PG-S1 or PG-C | PG-C where acid gases are measured |
| Coast plus refinery or chemical plant | PG-C | Thicker chemical-resistant film |
| Coast plus H₂S or ammonia | PG-C | Review copper content as well |
How the two combine
Salt deposits are hygroscopic and keep the coil surface wet. Sulphur dioxide and nitrogen oxides dissolve in that water and make it acidic. The acidic salt film attacks aluminium and copper faster than either salt or pollution alone.
Choosing one system
Pick the system for the harsher exposure. PG-S1 has data for 48 h immersion in 2% sulphuric acid and 2% sodium hydroxide without change, which covers general industrial air. Where acid gases, ammonia or H₂S are present at the site itself, move to PG-C.
What this means for your project
Name the nearest industry and its distance from the site, along with the distance to the sea. The coating selector combines both exposures in its recommendation.
Related
- CoatingsAir-Dry Two-Component Chemical-Resistant Coating
- EnvironmentsIndustrial Atmospheres (SO₂, NOx, Chlorides)
- ServicePre-Shipment Coil Coating in China
- ToolsCoil Coating Selector
Also see
- CoatingsWaterborne Polysiloxane (Sol-Gel) Coil Coating
- EnvironmentsCoastal HVAC Corrosion by Distance from the Sea
- EnvironmentsWastewater Treatment Plants (H₂S)
