CABLE SUPPORT SYSTEMS

CORROSION CLASSIFICATION
The choice of surface treatment are made according to factors effecting the product in the surrounding environment, as
specified in the SFS-EN ISO 12944-2 standard.
Corrosivity
category
Examples of typical environments in a temperate climate
(informative only)
Surface treatment required
Exterior Interior
C1
very low
Heated buildings with clean
atmospheres, e.g. offices, shops,
schools, hotels.
Hot galvanised sheet metal,
or plastic coated sheet metal.
C2
low
Atmospheres with low level of
pollution. Mostly rural areas.
Unheated buildings where
condensation may occur, e.g.
warehouses, sport halls.
Hot galvanised sheet metal,
or plastic coated sheet metal.
C3
medium
Urban and industrial atmospheres,
moderate sulphur dioxide
pollution.
Coastal areas with low salinity.
Production rooms with high
humidity and some air pollution,
e.g. foodprocessing plants,
laundries, breweries, dairies.
Hot galvanisation after
assembly.
C4
high
Industrial areas and coastal areas
with moderate salinity.
Chemical plants, swimming pools,
coastal ship- and boatyards.
Hot galvanisation after
assembly.
C5-I
very high
(industrial)
C5-M
very high
(marine)
Industrial areas with high humidity
and harsh atmosphere.
Coastal and offshore areas with
high salinity.
Buildings or areas with almost
permanent condensation and with
high pollution.
Hot galvanisation and epoxy
painting after assembly. Acidproof
steel. Surface treatment
chosen case-by-case.
Notes:
1. The loss values used for the corrosivity categories are identical to those given in ISO 9223.
2. In coastal areas in hot, humid zones, the mass or thickness losses can exceed the limits of category C5-M.
Special precautions must therefore be taken when selecting protective paint systems for structures in such areas.