National Museum in Mexico City supported
Kärcher freed the artistic fountain "Paraguas" in the courtyard of the Mexican National Museum of Anthropology of dust and sediments.
The artistic fountain "Paraguas" is situated in the centre of the Museum Square.
Four dry ice blasting units of the type IB 15/120 were used for the cleaning.
With the help of the dry ice blasting method, the soiling was removed.
Dry ice against dusts and encrustations
Months-long Kärcher cleaned the famous artistic fountain “Paraguas” (“umbrella”) in the inner courtyard of the National Museum for Anthropology in Mexico City as part of their cultural sponsoring.
The main problem on the structure, made of reinforced concrete and aluminium, were dust and encrustations that have built up since its construction in 1963 because of the constant humidity. In addition, some areas were corroded. The fountain was freed from these sediments by Kärcher’s cleaning experts with four dry ice blasting units of the type IB 15/120.
The dry ice blasting method
This method works with dry ice granules. The 3mm-large pellets consist of carbon dioxide held at a temperature of -79° Celsius. They are blasted via compressed air onto the surface of the object in need of cleaning with a speed of more than 150 m/s. The pellets shift from a solid to a gaseous state (sublimation) at the moment of impact. They penetrate the dirt and literally blast it from the surface because of the increase in volume during the sublimation, without damaging the aluminum underneath.
Gentle cleaning that doesn’t leave a mark
The sublimation leaves no residue of blasting abrasives that would otherwise have to be collected. “The method isn’t only effective but eco-friendly – it manages without chemical additives and leaves no waste whatsoever,” explains Thorsten Möwes, cleaning expert at Kärcher. This means that this method is suitable for use in restorations.
National Museum for Anthropology
The National Museum for Anthropology exhibits Mexico’s pre-Columbian past and native culture. It houses one of the most important archaeological collections in the world. The 23 halls are accessible from a central, open square. The artistic fountain stands in the center of this connecting square. The structure, made of reinforced concrete and aluminum, measures 54 by 82 meters at a height of almost 17 meters.
Facts at a glance
City: Mexico City
Soiling: Dusts, encrustation, corrosion
Cleaning technique: Dry ice blasting method
Execution: Spring / Summer 2018