Corrosivity classes

Below we describe the different environmental classes that occur where the products are installed. The corrosion classes are according to SS_EN ISO 12944-2 and take into account the corrosivity of the atmosphere as well as environmental examples. The examples below are typical environments in the temperate climate zone (informative).

Outdoor

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Indoor

Heated spaces with dry and negligible amounts of pollutants, e.g. offices, shops, schools and hotels.

Outdoor

Atmosphere with low levels of air pollution.
Rural areas.

Indoor

Non-heated spaces with varying temperature and humidity. Low frequency of air condensation and low levels of air pollution, e.g. sports halls and storage facilities.

Outdoor

Atmosphere with a certain amount of salt or moderate amounts of air pollution. Urban areas and lightly industrialised areas. Areas with some influence from the coast.

Indoor

Spaces with moderate humidity and some amount of air pollution from production processes, e.g. breweries, dairies, and laundries.

Outdoors

Atmosphere with a moderate amount of salt or significant amounts of air pollutants, in industrial and coastal areas.

Indoors

Spaces with high humidity and a large amount of air pollutants from production processes, e.g. chemical industries, swimming pools, and shipyards.

Outdoor

Industrial areas with high humidity and aggressive atmosphere.

Indoor

Spaces with almost permanent moisture condensation and large amounts of air pollutants.

Outdoor

Coastal and offshore areas with a high amount of salt.

Indoor

Spaces with almost permanent moisture condensation and high levels of air pollution.

Below is a calculation of the lifespan of the surface treatment until red rust occurs on the surface. Average wear per surface unit and unilateral thickness reduction during an exposure time of one year.

C1

Steel: average etching (g/m2): < 10

Steel: thickness reduction μm: ≤ 1.3

Zinc: average etching (g/m2): ≤ 0.7

Zinc: thickness reduction μm: ≤ 0.1

C2

Steel: average etching (g/m2): > 10–200

Steel: thickness reduction μm: > 1.3–25

Zinc: average etching (g/m2): > 0.7–5

Zinc: thickness reduction μm: > 0.1–0.7

C3

Steel: average wear (g/m2): > 200–400

Steel: thickness reduction μm: > 25–50

Zinc: average wear (g/m2): > 5–15

Zinc: thickness reduction μm: > 0,7–2,1

C4

Steel: average erosion (g/m2): > 400–650

Steel: thickness reduction μm: > 50–80

Zinc: average erosion (g/m2): > 15–30

Zinc: thickness reduction μm: > 2.1–4.2

C5-I

Steel: average corrosion (g/m2): > 650–1 500

Steel: thickness reduction μm: > 80–200

Zinc: average corrosion (g/m2): > 30–60

Zinc: thickness reduction μm: > 4.2–8.4

C5-M

Steel: average corrosion (g/m2): > 650–1 500

Steel: thickness reduction μm: > 80–200

Zinc: average corrosion (g/m2): > 30–60

Zinc: thickness reduction μm: > 4.2–8.4