According to SSPC-SP10/NACE 2, what is the limit of staining per each unit area?

In the context of SSPC-SP10/NACE 2, which covers the standard for near-white metal blast cleaning, the appropriate limit of staining is set at 5% of each unit area. This standard ensures that the surface being prepared for coating is free of contaminants and is conducive to a proper bond between the substrate and the coating. The 5% limit on staining indicates that any visible contaminants or rust stains should not cover more than this specified percentage of the surface area for the coating to adhere effectively. This threshold is crucial for achieving optimal results in corrosion protection and paint performance, as excessive staining can compromise the integrity of the coating system and lead to premature failure.

By adhering to this standard, inspectors can better assess the quality of surface preparation and ensure compliance with industry best practices, thus enhancing the overall durability and lifespan of the coating applied.