The SSPC - Vis 2 is the standard method for evaluating degree of rusting on painted steel surfaces. It has been revised recently and expanded.
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Features a series of 27 full color images and 27 black and white diagrams representing various degrees of spot, general, and pinpoint rusting on painted steel surfaces.
Test and tables provide a guide to the use of the reference photographs; a scale and description of standard rust grades; a comparison of SPPC, ASTM, ISO, and other rust grade scales; and other useful information.