ISO Corrosivity Categories

Corrosivity

Ultimately the biggest factor that controls the specification of paint you will require comes down to which of the ISO Corrosivity Categories your premises is in. We will provide use these standards to specify the best coating for your project. This will impact on whether the coating is water-based or solvent-based amongst other things. We use the industry standards as follows:

C1: Very low corrosivity

Examples include:

These are typically internal areas including heated buildings with clean atmospheres such as:

  • Schools
  • Offices
  • Hotels
  • Shops

C2: Low corrosivity

Example environments include:

  • Exteriors: primarily rural areas with low levels of pollution
  • Interiors: unheated buildings prone to condensation such as depots or sports halls

C3: Medium corrosivity

Example environments include:

  • Exteriors: urban and industrial atmospheres with moderate sulfur dioxide pollution; coastal areas with low salinity
  • Interiors: production rooms with high humidity and some air pollution such as:
    • Food processing plants
    • Laundries
    • Breweries
    • Dairies

C4: High corrosivity

Example environments include:

  • Exteriors: industrial areas, coastal areas with moderate salinity
  • Interiors: chemical plants, swimming pools, coastal ships and boat yards

C5: Very high corrosivity (harsh on-shore)

Example environments include:

  • Exteriors: industrial areas with high humidity and aggressive atmosphere
  • Interiors: buildings in areas with almost permanent condensation and with high pollution

CX: Very high corrosivity (offshore)

Example environments include:

  • Offshore exteriors: coastal and offshore areas with high salinity such as sea front protection barriers, oil rigs
  • Offshore interiors: buildings in areas with almost permanent condensation and with high pollution

If you would like to get hold of the full ISO standards it is available here: 

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