What does SSPC-SP6 advise about the quality of blast cleaning?

SSPC-SP6 is a standard that focuses on the requirements for commercial-grade blast cleaning. The specification defines the desired surface preparation level for steel and metal substrates before the application of protective coatings. According to SSPC-SP6, the surface must be near white, indicating that the majority of the surface should exhibit a clean and uniform appearance with minimal rust or contaminants remaining.

The term "near white" characterizes a substrate that has been blasted clean to the extent that it shows little to no visible residue of rust, scale, or other contaminants. Achieving this level of cleanliness is crucial for the effective adhesion and performance of coatings. This high standard is critical to ensure the longevity and integrity of the protective coating applied subsequently.