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Corrosivity Zone & Description of Environment

  • C1 – Environments found inside heated or air-conditioned buildings with clean atmospheres
  • C2 – Includes dry, rural areas, remote from the coast or sources of pollution and interior environments where some condensation may occur
  • C3 – City, industrial and coastal environments with moderate sulphur dioxide and salt exposure interior environments with high moisture levels
  • C4 – On the coast extending up to 1km inland and aggressive industrial environments, interior environments that are exposed to significant moisture and contamination e.g. indoor swimming pools.
  • C5 – I – Aggressive industrial areas where the environment may be acidic with a pH of less than 5
  • C5 – M – This category is offshore and on the beachfront in regions of rough seas and surf beaches