This standard provides a method to evaluate the degree of rusting on painted steel (or iron) surface. The reference color photographs and corresponding black and white images, which depict the percentage of rusting given in the written specification, form part of the standard. In the event of a dispute, the written definitions prevail.
This standard is particularly useful for evaluating rust on test panels or on localized areas of structures.
This standard quantifies the degree of rusting on painted steel surfaces with a zero to ten scale based on the percentage of visible rust present on the surface. Visible rust includes rust blisters and undercutting of the coating.
The distribution of the rust is classified as spot rust, general rust, or pinpoint rust.
Standard reference photographs depict the appearance of painted steel surfaces with the appropriate percentage of rusting for various distributions is not accompanied by blistering, but the photographs show staining associated with the rust. Black and white images highlight only those areas that are rusted. Both the color photographs and the black and white images enable the evaluator to assign an accurate rust grade.
