| Corrosion class | Examples of typical enviroments in temperate climates (informative) | | Recommended min. surface treatment |
| | Outdoors | Indoors | |
C1
very low | - | Heated buildings with clean atmosphere, e.g. offices, shops, schools, hotels e.t.c | Hot galvanised sheet metal (pre-galvanised) |
C2
low | Atmospheres with low levels of airborne pollution. Mostly rural areas. | Non-heated buildings where condensation may occur, e.g. warehouses, sport halls e.t.c | Hot galvanised sheet metal (pre-galvanised) |
C3
average | Urban and industrial atmospheres, moderate sulphur dioxide pollution. Coastal areas with low salt content. | Production rooms with high humidy and some air pollution, e.g. food-processing plants, laundaries, breweries, dairies e.t.c. | Hot dip galvanised after manufacture |
C4
high | Industrial areas and coastal areas with moderate salt content. | Chemical plants, swimming pools, coastal ship- and boatyards. | Hot dip galvanised after manufactute |
C5-I
very high
(industrial) | Industrial areas with high humidy and a harsh atmosphere. | Buildings and areas with almost permanent condensation and with high airborne pollution. | Hot dip galvanised and epoxy paint coated after manufacture. Stainless steel (AISI 304 or AISI 316L) |
C5-M
very high
(marine) | Coastal and offshore areas with high salt content. | Buildings or areas with almost permanent condensation and with high airborne pollution. | Hot dip galvanised and epoxy paint coated after manufacture. Stainless steel (AISI 304 or AISI 316L). |
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