Which standard is the WJ-1 visual cleanliness comparable to?

The WJ-1 visual cleanliness level refers to a specific standard of surface preparation for substrates that are to be coated. This standard is comparable to ISO SA 3, which requires that all visible rust, mill scale, and other contaminants are completely removed, leaving a clean surface. ISO SA 3 is characterized by a uniformly clean steel surface, which is essential for ensuring proper adhesion and performance of applied coatings.

The surface preparation achieved at WJ-1 aligns with this requirement by providing a thorough cleaning that meets the expectations set forth by ISO SA 3. This comparison highlights the importance of achieving a surface free of contaminants to allow for optimal coating adhesion and longevity. Understanding these standards helps inspectors assess the cleanliness of surfaces effectively and communicate the necessary requirements for successful coating applications.