CAPACITOR OIL HAVING EXCELLENT PROPERTIES IN WIDE TEMPERATURE RANGE

摘要

Provided is a capacitor oil which is characterized by being composed of 1,1-diphenyl ethane and benzyltoluene, and which is also characterized in that: the mass ratio of the 1,1-diphenyl ethane to the benzyltoluene is from 0.8 to 2.0; the total of ortho forms and para forms in the benzyltoluene is 90% by mass or less; and the kinematic viscosity of the capacitor oil at 40°C is 3.00 mm2/s or less. This capacitor oil is provided as an excellent capacitor oil which has a good balance between characteristics at room temperature and characteristics at low temperatures, and which is almost never susceptible to deposition of crystals particularly at -50°C, while maintaining high dielectric breakdown voltage within a wide temperature range from -50°C to 30°C.