FIELD: electricity.
SUBSTANCE: invention relates to the method for making a fibrous electret item from a polymer material, having a zeta-potential, which is higher or lower than - 7.5 mV. The item is charged by bringing it in contact with a water-based liquid having the following pH and conductivity values: (i) if an item has a zeta-potential of -7.5 mV or below, then liquid brought in contact with it has pH of more than 7 and conductivity from 5 to 9000 mcS/cm. If an item has a zeta-potential of more than -7.5 mV, then liquid brought in contact with it has pH of 7 and below and conductivity from 5 to 5500 mcS/cm.
EFFECT: electret item may have improved characteristics, especially if it is used as an electret filtering item.
19 cl, 6 dwg, 7 tbl, 110 ex
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