34 CORROSION CATEGORIES CORROSION CATEGORIES CORROSION LEVEL TYPICAL ENVIRONMENTS: EXAMPLES OF ISO9223 INDEX® COATINGS AVAILABLE INDOOR OUTDOOR C1 VERY LOW Heated spaces with low relative humidity and insignificant contamination, such as offices, schools, museums. Dry or cold areas, atmospheric environment with very low contamination and little humid weather, such as certain deserts, central Arctic or Antarctic. ZINC-PLATED ZINC-PLATED BLACK ZINC-PLATED WHITE PHOSPHATED COATED PLASTIC COATED C2 LOW Unheated spaces with variable temperature and relative humidity. Low condensation frequency and low contamination, such as storage, sports pavilions. Temperate areas, atmospheric environment with low contamination (SO2:<5 g/m3), such as rural areas and small cities. Dry or cold areas, atmospheric environment with little humid weather, such as deserts and sub-Arctic areas. ATLANTIS C2-H ATLANTIS C2-M ATLANTIS C2-L YELLOW ZINC PLATED BLUE ORGANIC GALVANISED C3 MEDIUM Spaces with moderate condensation frequency and moderate contamination from a production process, such as food processing plants, laundries, breweries, dairies. Temperate areas, atmospheric environment with medium contamination (SO2:5μ g/m3 to 30μ g/m3) or some chloride effects, such as urban areas, coastal areas with low chloride deposition. Tropical and subtropical area, atmosphere with low contamination. ATLANTIS C3-H ATLANTIS C3-M ATLANTIS C3-L STAINLESS AISI 430 C4 HIGH Spaces with high condensation frequency and high contamination from a production process, such as industrial processing plants. Temperate areas, atmospheric environment with high contamination (SO2:30 g/m3 a 90 g/m3) or substantial chlorides effects, such as contaminated urban areas, industrial areas, coastal areas without salt water spray (1-10 km), or exposure to strong salinity effects. Tropical and subtropical areas, atmosphere with medium contamination. ATLANTIS C4-M STAINLESS A2 (AISI 304) C5 VERY HIGH Spaces with a very high frequency of condensation and/or high contamination from a production process, such as mines, industrial vaults, unventilated spaces in tropical and subtropical areas. Temperate and subtropical areas, atmospheric environment with very high contamination (SO2:90 g/m3 to 250 g/m3) and/or significant chloride effects, such as industrial areas, coastal areas (0-1 km), protected installations on the coast. STAINLESS A4 (AISI 316) CORROSION CATEGORIES C1 C2 C3 C4 C5 ENVIRONMENTAL AND/OR ATMOSPHERIC CONDITIONS INDOOR WITHOUT CONDENSATION INDOOR WITH TEMPORARY CONDENSATION OUTDOOR IN RURAL AREAS WITH VERY LOW CONTAMINATION OUTDOOR WITH LOW CONTAMINATION 1-10 KM OUTDOOR WITH MODERATE CONCENTRATION OF CONTAMINATION 0-1 KM COASTAL AREAS OUTDOOR WITH STRONG INDUSTRIAL CONTAMINATION AREAS CLOSE TO ROADS QUICK SELECTION GUIDE * The selection indicated in the table is for expected exposures of 25 years, providing proper maintenance. * In the case of installations with approved products, the use in these environments is not covered by European Technical Approval (ETA) of anchors, where it is established that only stainless steel anchors may be installed outdoors and assuming a working life of the anchor of at least 50 years. PROTECTION AGAINST CORROSION
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