EN 12500:2000

Introduction
1 Scope
2 Normative references
3 Terms and definitions
  3.1 Corrosivity
  3.2 Corrosion likelihood
  3.3 Type of atmospheric environment
  3.4 Category of location
  3.5 Time of wetness
4 Classification of corrosivity of atmospheric
  environments
5 Determination of corrosivity categories
6 Estimation of corrosivity categories
  6.1 General
  6.2 Climatic influences
  6.3 Types of atmospheric environment
  6.4 Categories of location
      6.4.1 General
      6.4.2 Outdoor atmosphere
      6.4.3 Indoor atmosphere
Annex A (normative) Description of standard specimens and
        exposure conditions for determination of corrosivity
        categories
Annex B (normative) Chemical cleaning procedures for removal
        of corrosion products (in accordance with ISO 9226)
Annex C (informative) Correspondence between the mass loss
        per unit surface area and the thickness loss after
        1 year exposure for the corrosivity categories
Annex D (informative) Calculated time of wetness and selected
        climatological characteristics of the macroclimatic
        zones of the earth
Annex E (informative) Description of typical atmospheric
        environments related to the estimation of corrosivity
        categories
Bibliography

This EN establishes a classification system for the corrosivity of atmospheric environments. It: - defines corrosivity categories of the atmospheric environments taking into account ISO 9223; - describes the determination of corrosivity based on assessment of mass loss of standard specimens after the first year of exposure; - can be used to estimate the corrosivity of an environment based on knowledge of local conditions or of specific data that characterize the local conditions, where it is not possible to make an experimental determination.