Rust Grade Book

The ISO 8501-1 Rust Grade Book contains reference photographs representative of different rust grades and preparation grades that are used to specify the quality of surface preparation.

The Rust Grade Book identifies four levels (designated as rust grades) of mill scale and rust that are commonly found on surfaces of uncoated erected steel and steel held in stock. It also identifies certain degrees of visual cleanliness (designated as preparation grades) after surface preparation of uncoated steel surfaces and of steel surfaces after overall removal of any previous coating. These levels of visual cleanliness are related to the common methods of surface cleaning that are used prior to painting. Intended to be a tool for the visual assessment of rust grades and of preparation grades, it includes 28 representative photographic examples. High quality colour pictures of the blast-cleaning surface grades of Sa1, Sa2, Sa2.5 and Sa4, together with detailed descriptions. Incorporates pictures from the Swedish Standard SIS SS 05 59 00. Prepared by ISO (International Organization for Standardization).