The results of influence of a low-power highfrequency electromagnetic field by frequency from 30 to 200 MHz on kinematic viscosity of seed oils are resulted in the present paper. It has been found experimentally that viscosity value influences not only on frequency of electromagnetic field, but also on duration of field influence. The relaxation of seed oils viscosity descends within 3-5 days after irradiating, but viscosity isn’t reverted in a reference state. The effect of decrease in viscosity gives a chance to decrease hydraulic loss during pumping and transporting highviscosity liquids.

Key words: influence of a high-frequency electromagnetic field, decrease of hydraulic loss, kinematic viscosity, rapeseed oil, sunflower seed oil, seed oils.