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La teneur en polluants de surface est définie dans la norme ISO 8501 - 1.Pour les systèmes de pulvérisation à l'intérieur de la zone qgb, la plupart des procédés de revêtement nécessitent sa2,5.
Grade anti - rouille
| STANDARD | METHOD | DESCRIPTION OF FINISH |
| Sa 1 | Light blast cleaning | When viewed without magnification, the surface shall be free from visible oil, grease and dirt, and from poorly adhering mill scale, rust, paint coatings and foreign matter. |
| Sa 2 | Thorough blast cleaning | When viewed without magnification, the surface shall be free from visible oil, grease and dirt and from most of the mill scale, rust, paint coatings and foreign matter. Any residual contamination shall be firmly adhering. |
| Sa 2,5 | Very thorough blast cleaning | When viewed without magnification, the surface shall be free from visible oil, grease and dirt and from mill scale, rust, paint coatings and foreign matter. Any remaining traces of contamination shall show only as slight stains in the form of spots or stripes. |
| 3 | Blast cleaning to visually clean steel | When viewed without magnification, the surface shall be free from visible oil, grease and dirt and shall be free from mill scale, rust, paint coatings and foreign matter. It shall have a uniform metallic color. |
