Techniques used for cleaning:

  • mechanical cleaning
    • hot water – 140 bar
    • cold water – 160 / 500
  • chemical cleaning
    • with citric acid
    • with other chemicals
  • free-jet blasting
    • with sand, metal shots, nutshell, corundum or glass pearls
    • applications: oil industry, chemical industry, food industry, construction (e.g. cleaning of monuments)

Dry-ice blasting

This is a new but already globally spread technology in the field of industrial cleaning where the blasting material is dry ice. During the process little pieces (about the size of rice) of dry ice is blasted by a nozzle with high-pressure air onto the surface needed to be cleaned. Dry ice is the solid form of carbon dioxide at a temperature of -79 Celsius. The contaminants shrink due to the low temperature, thereby ceasing adhesion.

When a part of dry ice gets through the contaminants, it gets in direct contact with the warmer surface and evaporates while increasing to 750 times its solid volume. This has a gentle mechanical cleaning effect and also has the advantage that the removed layer (e.g. paint, graffiti, oil, grease, asphalt, tar, soot, ink, resin, adhesive) completely detaches from the surface, which becomes fully clean. Only the contaminants need to be removed, because the dry ice evaporates.

Applications:

  • electrical industry
  • oil indsutry
  • chemical industry
  • food industry
  • construction (e.g. cleaning of monuments)