SKU: 80862600

The Rust Grade Book specifies a series of Rust Grades and Preparation Grades of blast-cleaned steel surfaces. The various Grades are defined by written descriptions together with photographs.

The Rust Grades and Preparation Grades shown are examples taken from the Rust Grade Book to show the quality of the pictures and to assist with the understanding of the book.


The 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.

Four Rust Grades, designated A, B, C, and D respectively are specified. There are also fourteen Preparation Grades by blast-cleaning, indicating the degree of cleaning, together with detailed descriptions of the surface appearance to the following Sa Grades.

  • Grade Sa 1. Light blast-cleaning
  • Grade Sa 2. Thorough blast cleaning
  • Grade Sa 2½. Very thorough blast-cleaning
  • Grade Sa 3. Blast-cleaning to visually clean steel

Compiled by: ISO (ISO 8501-1)

Edition: Second. 2007-05-01

Translation: English, French, German & Swedish

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