Abstract: In order to study charges produced by friction in the anti-static clothing, drum friction measurement is used to produce accumulated charges, then these charges are observed by Faraday cage and related devices, and the charge distribution is focused to consider under the same and different relative humidity (RH). Friction time effect is also investigated. The results showed: 1) The distribution of electric charges is between 0.10μC and 0.40μC, and relatively disperse for the 0.2μC criteria in GB12014—2009. Above 50 tests are more reliable for the value record. 2) As each friction time extends, the magnitude of electric charges does not increase. However, the mean value of electric charges slightly decreases as the friction cycle increases. 3) It is demonstrated that electric charges decrease as the RH increases in the 60% distribution zone (0.19μC—0.25μC). However, the trend is not obvious for overall charge distribution.

Key words: relative air humidity, anti-static clothing, accumulated static charge, average value of electric charge