ISO 8501-1 Blast Cleaning and Hand and Power Tool Cleaning Grades

Question 1

Blast Cleaning to Visually Clean Steel

When viewed without magnification, the surface shall be free from visible oil, grease, dust, dirt, and shall be free from the mill scale, rust, paint coatings, and other foreign matter. IT SHALL HAVE A UNIFORM METALLIC COLOR.

Answer 1

ISO 8501-1 Sa 3

Question 2

Very Thorough Blast Cleaning

When viewed without magnification, the surface shall be free from visible oil, grease, dust, dirt, and shall be free from the mill scale, rust, paint coatings, and other foreign matter. Any remaining traces of contamination will show only as slight stains in the form of spots or stripes.

Answer 2

ISO 8501-1 Sa 2 1/2

Question 3

Thorough Blast Cleaning

When viewed without magnification, the surface shall be free from visible oil, grease, dust, dirt, and shall be free FROM MOST OF the mill scale, rust, paint coatings, and other foreign matter. Any residual contamination shall be firmly adhering.

Answer 3

ISO 8501-1 Sa 2

Question 4

Light Blast Cleaning

When viewed without magnification, the surface shall be free from visible oil, grease, dust, dirt, and from poorly adhering mill scale, rust, paint coatings, and foreign matter.

Answer 4

ISO 8501-1 Sa 1

Question 5

Thorough Hand and Power Tool Cleaning

When viewed without magnification, the surface shall be free from visible oil, grease, dust, dirt, and from poorly adhering mill scale, rust, paint coatings, and foreign matter.

Answer 5

ISO 8501-1 St 2

Question 6

Very Thorough Hand and Power Tool Cleaning

Same as for St 2, but the surface shall be treated much more thoroughly to give a metallic sheen arising from the metallic substrate.

Answer 6

ISO 8501-1 St 3