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Super hydrophobic, plasma removable coating for the protection of cultural heritage assets
 

super hyfrophobic

 

After the cleaning process (by chemical and/or physical methods) cultural heritage assets are protected by organic or hybrid coatings. The removability of such a coating is paramount as it must always be possible to bring the artifacts back to their original state.
The coatings that are currently being used are mostly solvent removable and not very hydrophobic (contact angle < 100°). This lack of water repellency causes the water to accumulate on the surface where it will collect dirt and pollutant that will inevitably attack the coating and the underlying artifact (soot deposition, corrosion, black crust…)

The new coating, developed by ChemStream, displays super-hydrophobic qualities when applied. A water contact angle larger than 155° is reached causing the water droplets to ‘bounce’ off the surface, even at very low sliding angles. In the video’s a comparison has been made of water droplets falling on a cleaned marble substrate which is protected with a commercial coating on one hand and coated with the ChemStream coating on the other hand.

     
super hydrophobic   Additionally the ChemStream coating remains completely removable by using an atmospheric plasma torch. This state-of-the-art technique allows pin-point non-contact removal of the coating so that specific areas of the surface may be treated while leaving adjacent areas untouched.
     
Video's



   
super hydrophobic