In order to investigate the self-cleaning efficiency two commercial self-cleaning TiO2 coated glasses and an uncoated float (reference) glass were exposed to the environment under two different sets of experimental conditions. The first experiment involved the exposure of glass panels in unsheltered conditions for 16 months in France & England. Macroscopic observations were performed monthly by panels of ten end users & a visual ranking of the samples was given according to standardised guidelines. Haze values were also measured by means of a haze meter. A good correlation between the haze and the visual evaluation of samples was obtained. In general, a lower level of soiling was detected on the self-cleaning glasses. The second exposure was carried out in Paris(France); samples were exposed to sheltered & unsheltered conditions.
