Abrasive blast cleaning is the most comprehensive method for the removal of mill-scale and rust on steel surfaces. The method involves the use of high-velocity abrasive particles from a jet stream of compressed air or centrifugal impellers to ‘blast’ clean the steel surface.
Blast cleaning helps in surface preparation by removing contaminants before coating, painting, or lining. Surface cleaning removes rust and other contaminants which could cause problems with paint adhesion, or in the most extreme cases, compromise the integrity of the surface metal itself.
The standard grades of cleanliness for abrasive blast cleaning in accordance with BS EN ISO 8501-1 are:
- Sa 1 – Light blast cleaning
- Sa 2 – Thorough blast cleaning
- Sa 2½ – Very thorough blast cleaning
- Sa 3 – Blast cleaning to visually clean steel
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