The corrosion classes below describe - with examples - under which conditions treatments for iron and metal are providing sufficient corrosion protection.
|C1||Very low||Heated buildings with clean air, such as offices, shops, schools, hotels, etc.||None|
|C2||Low||Buildings not heated, where condensation may occur, such as warehouses and sports halls.||Atmosphere with low pollution. For example in the country.|
|C3||Middle||Buildings for production with high atmospheric humidity and some air pollution such as food manufacturers, breweries, dairies and laundries.||Urban and industrial areas, moderate sulphur dioxide pollution. Coastal areas with low salt content.|
|C4||High||Chemical manufacturers, swimming baths and ship- and boatyards by the sea.||Industrial areas and coastal areas with moderate salt impact.|
|C5-I||Very high -
|Buildings or areas with almost permanent condensation and with high pollution.||Industrial areas with high humidity and aggressive atmosphere.|
|C5-M||Very high||Buildings or areas with almost permanent condensation and with high pollution.||Coast and offshore areas with high salt content.|
Comment( DS Manual 124:2000)
Corrosion categories C1 og C2 do not exist in Denmark. Due to the prevailing wind conditions at the Danish west coast, corrosion category C5-M may occur as far as 25 km inside the country.