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Cleaning an surface preparation can be done from SSPC-SP7 Brush off Blast up to SSPC-SP5 White Metal Blast Cleaned Surface. A white metal blast cleaned surface, is when 100% of the surface must be free of all visible oil, grease dust, dirt, mill scale, rust, coating, oxides, corrosion products, and other foreign matter. No staining is allowed when viewed without magnification.
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