What are SSPC/VIS 4 and VIS 7 used for in relation to waterjetting?

SSPC/VIS 4 and VIS 7 are specifically designed as visual comparators for evaluating the cleanliness of surfaces prepared by waterjetting. These standards provide a means to visually assess the degree of cleanliness achieved during surface preparation, which is crucial because the effectiveness of coatings often depends on the quality of the surface to which they are applied. By using these visual comparators, inspectors can determine if the standards for surface cleanliness have been met, ensuring that the conditions are suitable for optimal adhesion of coatings. This focus on visual assessment aligns with the importance of ensuring that surfaces are properly prepared before coating applications, which can have significant impacts on the longevity and effectiveness of those coatings.