Sandblasting and shot blasting is a cold abrasive treatment of metal structures surfaces from corrosion products, layer scale, soot, old paint coatings, plaster, dirt and other types of pollution.
The treatment performs by exposure to the surface by siliceous sand or other abrasive material (cooper slag, nickel slag) sprays by airflow under pressure.
Sandblasting is one of the main stages of surface preparation before applying various anti-corrosion or decorative protective coatings. The service life of the coatings greatly increases applied on the surface treated by sandblasting.
Requirements to quality of metal surface preparation before painting and metallized coating drawing established by GOST 9.402-2004. Four degrees of sandblasted ferrous metal surface from scale and corrosion products emphasized:
1 – scale and rust are not detected under view with a 6-fold increase.
2 – scale, rust, burn, molding mixture residues and other non-metallic layers are not detected by the naked eye.
3 – spots and strips of tightly bonded scale and casting edge visible by the naked eye on up to 5% of the surface. Not more than 10% of the plate area of 25×25 mm is occupied on any part of the surface of the product with scale.
4 – rust and flaking scale removed from the surface.
These degrees of metal sandblasting correspond to the degrees Sa 3, Sa 2½, Sa 2 and Sa 1 identified by the international standards ISO 8501-1: 2014.
We select individual technologies, raw materials, rates and methods of processing for each work thereby ensuring high quality of services.