Synthetic fluids of class 7 group 2, as an insulating and cooling material are selected as specimens, and it is studied for the physical properties. Also, benzotriazole (BTA) known as suppressant of streaming electrification is added to specimen, and the change of physical and electrical properties by addition of BTA is investigation. From the spectrum of FT-IR, it is confirmed that the absorption peak in wavenumbers 3400/spl sim/3450[cm/sup -1/] is small or disappears when BTA is added. AC breakdown strength and volume resistivity of each specimen are investigated. It is considered that the optimum content of BTA is about 10[ppm] for the suppression of electrification in this experiment.
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