In urban areas, there are large paved areas with cement pavers or natural stones. These are typically cleaned regularly by maintenance vehicles but there are still problems with biofouling. Urban areas also tend to have inferior air quality –  an related problem, but one with the same solution: photocatalysis. However many photocatalytic coatings do not work very well under these conditions: abrasion from machine cleaning will quickly remove any surface layer that does not have extreme hardness and adhesion. Even just the wear and tear from pedestrians may be too much for some products.

Joma offers solutions for paving stones that embed into the pores of the concrete where it is protected from abrasion. This is even the case for the Joma Hydro products, where both the photocatalytic and water-protecting layers are protected from wear. Since the pores have a large total surface area, this adds to the efficiency of the product as long as the pores are open. Dirt and dust can clog the pores, but the hydrophilic pores in the active layer help water penetrate below such fouling and wash it out. For this job, machine washing and protective coating play on the same team.

To clarify: the surface cleaning is eased by the hydrophilic property of the active titania, while the pores further in are hydrophobic to stop water from penetrating. This deliberate combination of opposite properties is part of what makes our products unique.

  • ·       PROBLEM: Protective coatings are worn away by machine cleaning and normal wear. Without washing, inorganic dirt and dust blocks the self-cleaning activity.
  • ·         SOLUTION: Joma photocatalytic coatings penterate into pores and is not washed off. Air and surface cleaning effects work well in combination with normal cleaning.


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