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Paint Preparation for Steel
The Steel Structure Painting Council (S.S.P.C.) classifies surface preparation for steel in the following categories:
- Solvent Cleaning: (SP1)
The removal of oil, grease, dirt and other
contaminants by using solvents, cleaning compounds, emulsions or steam.
- Hand Tool Cleaning: (SP2)
The removal of loose rust, mill scale and paint by
wire brushing, chipping, scraping and sanding.
- Power Tool Cleaning: (SP3)
The removal of loose rust, mill scale and paint by using power chipping hammers, grinders, descalers, sanders and wire brushes.
- Flame Cleaning of New Steel:
The removal of rust and mill scale by the use of flame, followed by wire brushing.
- White Metal Blast Cleaning: (SP5)
The removal of all visible rust, mill scale and other contaminants by abrasive blast cleaning.
- Near-White Metal Blast Cleaning: (SP10)
The removal of 95% of all visible rust, mill scale and other contaminants by abrasive blast cleaning. Recommended for corrosive environments (highly humid, marine or chemical exposure).
- Commercial Blast Cleaning: (SP6)
The removal of two-thirds of all visible rust, mill scale and other contaminants by abrasive blast cleaning. Recommended for severe environments.
- Brush-Off Blast Cleaning: (SP7)
The removal of all rust, mill scale and other contaminants except those tightly held to the surface. Not recommended for severe environments.
- Pickling: (SP8)
The removal of all rust, mill scale and other contaminants by chemical or electrolytic pickling.
- Weathering, followed by Blast Cleaning: (SP9)
Weathering for mill scale removal, followed by blast cleaning to one of the standards listed.
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