Sandblasting is the process of forcibly propelling a stream of sand (or other abrasive material) through a nozzle against a metal surface under high pressure in order to remove completely or partially the surface contaminants, enabling as well to roughen the surface for better coating adhesion. Grit-blasting has been in wide use for several decades as the most effective method for preparing large metallic surfaces. The main advantages that led to its spread are that:

  • Creates surface of high purity, free from paint and oxidation products.
  • Provides high cleaning performance.
  • Achieves proper surface for the subsequent application of the coating.
  • Provides flexibility and adaptability to different applications or locations.

The three degrees of surface preparation by sand-blasting (cleaning qualities) are as follows:
SA 1
Light grit blasting (simple cleaning), until the removal of loose mill scale, loose rust and detached impurities (adhered residues still remain).
SA 2
Thorough grit-blasting (commercial grit-blasting) until all mill scale, rust and impurities are removed. In this case clean, dry compressed air or brush is used until 65% of surface is free from visible residue. The surface should be grey after the application of this method.
SA 2 ½
Very thorough grit-blasting. Mill scale, rust and impurities are removed so well (up to 95%) that the remaining traces look like light shades or lines.

Since its establishment, CORAL CORROSION CONTROL is engaged in sandblasting operations in compliance with the Swedish standards and we offer to our marine and industrial customers cost effective surface preparations!