Surface Comparator Sa2.5 & Sa3

Make - Rubert

Surface Comparator ( Sa2.5 For Sand and Short blasting, Sa3 for Grit blasting )

Sa 2.5 and Sa 3 are two premium cleanliness grades for abrasive blast-cleaned steel defined by the ISO 8501-1 standard. Inspectors use standard visual comparators—photographic guides or metal plates—to verify these levels by matching the steel’s appearance to the reference criteria.

( 1 )- Sa 2.5 (Near-White Blast Cleaning) requires all rust, scale, and coatings to be removed, leaving only faint stains on up to 5% of the surface. It is the most common industry standard for high-performance coatings. [1] (https://huilicoating.com/sa-2-5-vs-sa-3-blast-cleaning-steel-coating/)

( 2 ) - Sa 3 (White Metal Blast Cleaning) demands a 100% uniform metallic sheen, completely free of any visible contaminants, usually reserved for extreme environments