Covers

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Corrosion class Environmental corrosion Examples of typical environments in temperate climates (informative) Wibe Group designation
Outdoors Indoors
C1 Very low   Heated areas with arid atmosphere and insignificant quantities of pollutant, e.g. offices, shops, schools and hotels. Electro-galvanized
DIN 50961/ISO 2081
C2 Low Atmospheres with low levels of airborne pollution. Rural areas. Non-heated areas with fluctuating levels of temperature and humidity. Few instances of condensation and low levels of airborne pollution, e.g. sports halls and warehouses. Pre-galvanized
Z 275 in accordance with EN 10346
C3 Average Atmospheres containing some salt or average levels of air-borne pollution. Urban and light industrial areas. Areas affected by coastal conditions. Areas with average levels of humidity and some airborne pollution resulting from production processes, e.g. breweries, dairies, laundries. Hot-dip galvanized
after manufacture in accordance with EN-ISO 1461		 Zinc+ coating
C4 High Atmospheres with average salt content or discernible levels of airborne pollution. Industrial and coastal areas. Areas of high humidity and considerable airborne pollution as the result of production processes, e.g. chemical plants, swimming pools and dockyards.
C5 Very high Industrial areas with high humidity and aggressive atmosphere, and coastal areas with high salinity Buildings with almost permanent condensation and with high pollution Zinkpox®
HDG+powder coating
Stainless steel
EN 1.4301/AISI 304
CX Extreme Offshore areas with high salinity, industrial areas with extreme humidity, and aggressive atmospheres, sub-tropical or tropical atmospheres. Industrial buildings with extreme humidity and aggressive atmosphere. Stainless steel
EN 1.4404/AISI 316L