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ระดับของมลพิษบนพื้นผิวที่กำหนดไว้ใน ISO 8501-1 สำหรับระบบการยิง peening ภายในช่วง qgb ส่วนใหญ่ของกระบวนการเคลือบต้องใช้ sa2 445 สำหรับฉีด
เกรดป้องกันสนิม
| 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. |
