Angular single-use blasting abrasive based on blast furnace slag
Optimal surface preparation for long-lasting steel structures
Suitable blasting media for structural steelwork
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Perfect adhesion starts with the right blasting media
In modern structural steelwork, the service life and safety of a structure depend directly on the quality of the surface. Whether bridges, halls, beams, tanks, or steel pipes—every surface must be thoroughly prepared before coating or galvanizing. Only a cleanly blasted and evenly roughened surface ensures lasting adhesion of protective layers and therefore long-term corrosion protection.
Blasting media play a key role in this. They reliably remove rust, mill scale, old coatings, or dirt, creating the basis for high-quality coatings, paint finishes, or metallic coatings.
Why blasting media are indispensable in structural steelwork
In structural steelwork, components are often exposed to extreme loads. Weather, moisture, mechanical stress, or chemical influences can attack the surface. To prevent corrosion, steel components must therefore be thoroughly cleaned and prepared after fabrication or assembly.
Blasting is the most effective method for this. The targeted use of blasting media completely removes rust, mill scale, and contaminants.
The requirements for blasted surfaces in structural steelwork are defined in standards such as ISO 8501–1 (cleanliness grades Sa 2½ to Sa 3) and ISO 8503 (roughness grades). Only by complying with these standards can a protective coating perform effectively in the long term.
Application tips for blasting in structural steelwork
Select the blasting media according to material thickness, component type, and the desired surface quality. Coarse-grained steel abrasives, for example, are suitable for load-bearing elements, while fine blasting media are better suited for sensitive surfaces.
Surface roughness is crucial for coating adhesion. For corrosion protection systems in structural steelwork, different roughness levels are generally recommended.
Excessive pressure can damage the surface; too little pressure will not remove rust completely. Regular checks of blast nozzles and feed rate help achieve consistent results.
Used blasting media should be sieved regularly and freed from dust. Contaminated blasting media reduces cleaning performance and increases wear on the equipment.
After blasting, steel begins to oxidize within just a few hours. The primer or galvanizing should therefore be applied within four hours to preserve surface cleanliness.
Modern blasting systems with extraction and on-site enclosures minimize dust emissions. Also ensure suitable personal protective equipment, including a respirator, gloves, and protective suit.