SSPC-SP6 refers to which of the following standards?

SSPC-SP6 is commonly known as the 'Commercial Blast Cleaning' standard and is indeed aligned with the surface preparation criteria established by the SSPC (Society for Protective Coatings). This standard defines the necessary surface cleanliness and profiling required for optimal coating adhesion, focusing specifically on the removal of mill scale, rust, and old coatings.

Selecting this standard indicates a focus on achieving a surface that is clean and free of contaminants while still retaining some slight profile to ensure good mechanical adhesion when coatings are applied. It is crucial for applications where durability and long-term performance of coatings are paramount.

The other options relate to different levels or types of surface cleanliness that do not match the designation of SSPC-SP6. For instance, NACE 2 and NACE 1 pertain to lesser definitions of cleanliness, while NACE 5 refers to standards that emphasize a different level of preparation than what SSPC-SP6 represents. These distinctions highlight the importance of selecting the right surface cleaning standard according to the specific requirements of a project.