Abrasive blasting

Sa2.5 - Very thorough abrasive blasting

When viewed without magnification, the surface should be free from visible oil, grease, and dirt, as well as scale, rust, paint coatings, and foreign matter. Any residual traces should be only minor spots or streaks of discoloration.

Sa3 - Abrasive blasting for visually clean steel

When viewed without magnification, the surface should be free from oil, grease, and dirt, as well as scale, rust, paint coatings, and foreign matter. The surface should have a uniform metallic color.

Manual and power tool derusting

St3 - Very thorough manual and power tool derusting

When viewed without magnification, the surface should be free from oil, grease, and dirt, as well as scale, rust, paint coatings, and foreign matter. The surface should have the luster of the metal substrate.