What defines a surface covered with and rust according to SSPC-VIS1?

The correct answer, Grade B, indicates a specific condition of a surface that is covered with rust according to the SSPC-VIS1 (Society for Protective Coatings Visual Standard). In this standard, Grade B surfaces are characterized by moderate rusting, where the surface has areas of rust, but the underlying substrate is still visible through the rust.

This grading system helps inspectors and coatings professionals communicate effectively about the condition of surfaces before painting or coating applications. Grade B surfaces typically show some level of deterioration, which may require preparation techniques such as cleaning and possibly rust removal before applying any protective coatings. The visual characteristics defined in this standard are crucial for helping to decide the appropriate surface preparation needed to ensure the best adhesion and longevity of coating systems applied afterward.

Understanding these grades helps to streamline communication on job sites and to establish expectations concerning surface preparation, ultimately leading to better protective outcomes in coatings application.