CAPACITOR OIL EXHIBITING EXCELLENT PERFORMANCE IN WIDE TEMPERATURE RANGE

摘要

The present invention provides a capacitor oil that can maintain breakdown voltage at a high level in a wide temperature range of -50°C to 30°C, extremely unlikely precipitates as crystals in particular at -50°C and thus has excellent properties both at normal temperature and a lower temperature. The capacitor oil of the present invention comprises 1,1-diphenylethane and benzyltoluene, wherein the mass ratio of 1, 1-diphenylethane to benzyltoluene is 0.8 to 2.0, the total amount of the ortho-isomer and para-isomer in the benzyltoluene is 90 percent by mass or less, and the composition has a 40°C kinematic viscosity of 3.00 mm 2 /s or lower.