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CORROSIVITY CLASS ACCORDING TO PN- EN ISO 12944-2		EXAMPLES OF ENVIRONMENTS TYPICAL MODERATE CLIMATE (INFORMATIVE ONLY)
CORROSIVITY CLASS ACCORDING TO PN- EN ISO 12944-2		OUTSIDE	INSIDE
C1	very low	N/A	Heated buildings with clean atmosphere, eg. offices, shops, schools, hotels
C2	low	Atmospheres polluted to a small extent mainly rural areas.	Unheated buildings, in which condensation may occur, eg. warehouses, sports halls.
C3	average	Urban and industrial atmospheres, average dioxide pollution sulphur (IV). Coastal areas with low salinity.	Production rooms with high humidity and some pollution of air, eg. food processing plants, laundries, breweries, dairies.
C4	high	Industrial areas and coasteel areas with medium salinity.	Chemical plants, swimming pools, repair shipyards of ships and boats.
C5-I	very high (industrial)	Industrial areas with high humidity and aggressive atmosphere.	Structures or areas with almost permanent condensation and high pollution.
C5-M	very high (marine)	Coasteel areas and away from shore into the sea with a large salinity.	Structures or areas with almost permanent condensation and high pollution.