"Corrosion class" describes - with environmental examples - under what conditions treatments for iron and metal provide sufficient corrosion protection.
| Corrosion class 0: No aggressiveness. | |
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Examples, interior: Rooms with relative humidity less than 60% (for instance offices) |
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| Corrosion class 1: Insignificant aggressiveness. | |
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Examples, interior: Unheated ventilated rooms without condensation. Heated rooms with relative humidity above 60%, but without condensation. | |
| Corrosion class 2: Medium aggressiveness. | |
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Examples, interior: Rooms with changing influence of humidity and condensation for a short period. |
Examples, exterior: Changing influence of humidity. Rural atmosphere far away from industry. |
| Corrosion class 3: High aggressiveness. | |
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Examples, interior: Changing humidity with heavy condensation. Chemical influence. |
Examples, exterior: In constantly moist environment. At heavy air pollution |
| Corrosion class 4: Very high aggressiveness. | |
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Examples, interior: Constantly moist rooms (breweries, slaughterhouses, swimming halls). Chemical influence. Submergence. |
Examples, exterior: Polluted coastal atmosphere. Chemical influence. In water. In earth. |
The corrosion classes are in accordance with Danish Engineer Association's instructions for corrosion protection of steel constructions: DS/R 454.