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    The Impact of Self-Cleaning Glass

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    Today there is yet one more invisible coating available to improve the properties of window glass. At first there were the nearly invisible, low-emissivity coatings, which admit daylight. Some of them can also admit beneficial passive solar gain. These prevent winter heat loss by reflecting, or not emitting, long-wave (10 micrometer wavelength) infrared thermal radiation. These low-emissivity coatings also enhance the effectiveness of heat absorbing solar control tinted glass, and reflective coatings, by preventing absorbed solar heat from radiating towards the room side of a window. Now clear, self-cleaning coatings are available for the outer surface of the window. These coatings act in different ways to prevent the deposition and build-up of dirt. Some can rinse inorganic dust off the glass with rain or water by their hydrophobic, or hydrophilic properties. Some of them can break down deposited organic dirt using a catalytic action powered by the ultraviolet component of daylight.


    glass, self-cleaning, hydrophobic, hydrophilic, photocatalytic

    Author Information:

    Barry, CJ
    Director of Technical Services, Pilkington North America Inc., Toledo, OH

    O'Day, T
    Pilkington North America Inc., Toledo, OH

    Committee/Subcommittee: E06.51

    DOI: 10.1520/STP11052S