scope:

This part of ISO 8501 specifies a series of preparation grades for steel surfaces after localized removal of previous paint coatings The various preparation grades are defined by written descriptions (see clause 4) together with the representative photographic examples given in ISO 8501-1. In addition, photographs showing examples of preparation grades P Sa 2½ and P Ma are given.

This part of ISO 8501 is applicable to sudaces prepared for painting by methods such as blast-cleaning, hand- and power-tool cleaning, and machine abrading.

This part of ISO 8501 relates the cleanliness of a surface to its visual appearance. In many instances this is sufficient, but for coatings likely to be exposed to severe environments, such as water immersion and continuous condensation conditions, consideration should be given to testing for soluble salts and other invisible contaminants on the visually clean surface by the physical and chemical methods which form the subjects of the various parts of ISO 8502. The roughness characteristics of the surface should also be considered by reference to ISO 8503.