Weatherability checklist
This powder coating weatherability liftetime checklist interrelates the material choice,the pretreatment,the environmental corrosivity classes and the expected lifetime.
| Substrate | Pretreatment | Primer | Topcoat | Total Layer Thickness(um) |
Environmental Corrosivity Class |
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| C1-C3 | C4 | C5 | |||||
| Aluminum | Chromatation Or Chrome-Free Chemical Conversion Layer |
– | PT | 80 | C | B | * |
| EM | PT | 130 | C | C | * | ||
| Oxyprim (Washprimer) | – | PT | 80 | B | – | – | |
| EM | PT | 130 | B | A | – | ||
| Steel | Metallisation | – | PT | 80 | C | A | – |
| EM | PT | 130 | C | B | * | ||
| Hot-Dip Galvanisation + Softly Shotblasting With Corundum |
– | PT | 80 | C | A | – | |
| EM | PT | 130 | C | B | – | ||
| HotDip Galvanisation + Chromatation Or Tricationic Phosphatation |
– | PT | 80 | C | C | – | |
| EM | PT | 130 | C | C | * | ||
| Shotblasting | Zincoprim | PT | 130 | C | B | – | |
| Tricationic Phosphatation | – | PT | 80 | C | B | – | |
| EM | PT | 130 | C | C | – | ||
| Tricationic Phosphatation + Cataphoretic Liquid Primer (KTL) |
– | PT | 100 | C | C | * | |
| Iron Phosphatation | – | PT | 80 | A** | – | – | |
| EM | PT | 130 | A** | – | – | ||
| Legend Expected lifetime A 2 – 5 years B 5 – 10 years C > 10 years |
*: to be checked per project **: if C1 = >10 years EM = epoxy powder primer PT= polyester topcoat |
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Environmental Class
| Environmental class | Some environmental examples | |
| Inside | Outside | |
| C1 Very low |
Heated buildings with clean atmosphere (shop,office, hospital) |
|
| C2 Low |
Unheated buildings where condensation can occur (sports hall, warehouse) |
Atmosphere with low pollution, mostly rural |
| C3 Intermediate |
Production area with high humidity and some air-pollution (laundry, brewery, dairy factory) |
Urban or industrial areas with moderate SO2 pollution; coastal areas with low salinity |
| C4-High | Chemical factory, outdoor swimming pool, shipyard and dockyard in coastal area |
Industrial areas with high SO2 pollution and coastal areas with moderate salinity |
| C5- Very high (industrial) |
Buildings with almost permanent condensation and high pollution (indoor swimming pool) |
Industrial areas with high humidity and aggressive atmosphere |
| C5-M Very high (marine) |
Buildings with almost permanent condensation and high pollution |
Coastal and offshore areas with high salinity |
D5 Creation