Which blast-cleaning level is the highest (most thorough)?

Which blast-cleaning level is the highest (most thorough)?

• A. White Metal
• B. Industrial
• C. Near White Metal
• D. Brush Off

Answer: (A)

Blast cleaning levels describe how clean the metal surface is after abrasive blasting. White Metal indicates the highest level of cleanliness because the surface is free of rust, scale, old coatings, oils, and other contaminants, revealing bright, unoxidized metal. This pristine surface gives the strongest coating adhesion and the best long-term protection. Near White Metal is almost as clean but may show a faint stain or minute oxidation. Industrial blast cleaning removes most contaminants but leaves a bit more oxide film, and Brush Off leaves noticeable rust or residues. So the top choice is White Metal since it represents the most thorough surface preparation.

Blast cleaning levels describe how clean the metal surface is after abrasive blasting. White Metal indicates the highest level of cleanliness because the surface is free of rust, scale, old coatings, oils, and other contaminants, revealing bright, unoxidized metal. This pristine surface gives the strongest coating adhesion and the best long-term protection.

Near White Metal is almost as clean but may show a faint stain or minute oxidation. Industrial blast cleaning removes most contaminants but leaves a bit more oxide film, and Brush Off leaves noticeable rust or residues. So the top choice is White Metal since it represents the most thorough surface preparation.