Which standard reflects the minimum requirement for abrasive cleaning?

The standard that reflects the minimum requirement for abrasive cleaning is SA2.5. This classification indicates a thorough cleaning process where all visible rust, mill scale, and coatings are removed to result in a clean, uniform, and suitably prepared surface for subsequent treatment or coating application.

SA2.5 is specifically designed for cases where a higher degree of cleanliness is required than that provided by SA2, which allows for some light staining, but less than the complete removal of contaminants seen in SA3, which signifies a surface that is completely clean and also free of stains or debris. This makes SA2.5 a balanced option that ensures a surface is adequately prepared while still offering a realistic standard for practicality in various applications.

Understanding these classifications is crucial for ensuring that the surface preparation meets the specific requirements of the material being treated, thereby enhancing the longevity and performance of coatings applied afterward.